Their harmonization is pretty good... I don't get why people are bashing Krystal.. This song requires smooth and soft voices

Chen harmonises very, very well with krystal. He's also kind enough to lower his tone so it would match krystal's. But still, krystal's voice matches this soothing song. So it's a good thing that chen did that. Don't compare their voices with other's. They've already proven themselves worthy of this song with that kind of singing. It's simply beautiful. So please just enjoy ^_^

I think Chen and Krystal's voices blend better than Chen's and Luna's did. They both have really pretty voices that make any song emotional, ugh. Love it :3

다신 못 볼 조합이지만 슴더발 중 가장 좋아하는 노래

the tune is sweet. krystal voices is sweet. chen voices is sweet i literally died on sweet x_x

Krystal fits this song! I love her voice too~ Crystal Clean, and sweet

Krystal can sound so much like Jessica sometimes. I love this song, it's really mellow and easy going, I love it.

She was just 19 and he was just 21 cutie pies have come a long way... Krystal waiting for your solo album❤

This song is giving me diabetes. It's so sweet and calming. I love Chen and Krystal's voice together. Who's watching in 2016?🙋🏻

chens not singing really high... i love it!!! deep and hot voice chen!! beautiful!!

i like krystal's voice

who's watching this in 2020? ALSO WHY IS THIS NOT ON SPOTIFY :(((

I don't know why people keep blaming things on Lee Soo Man. Why can't y'all differentiate voices? They didn't choose Krystal to sing for this song because they "liked" her more than Luna. Luna's voice is amazing, yes, but her voice is too powerful for this. Krystal has a sweeter (and sharper) voice, that's why it's more suitable for her to sing this song instead of Luna. Luna's powerhouse voice and singing techniques would take away the desired pitch for this song. Calling yourself an f(x) fan without even knowing what kind of voice your idols have is shameful. I'm standing by this, don't even think about arguing. Also, whatever happens behind the screens does not concern anybody nor the fans. Don't stir up unnecessary things. Even if they fight, it's their problem, not ours. Y'all needa calm down and take what you're given, shut up and watch what you're shown. Your bias is not "yours", they're working. As entertainers, they're already stressed more than any human being should be, so if you love your biases, stop creating extra issues for them. I hate to see how tired Krystal looks. Babygirl needs a break, even a short one would be good.

둘 다 목소리 왜이렇게 예쁠까..

Chen's voice is so clear and stable, I love his singing ^^ Beautiful song, really sweet~

Everyone, STOP bashing and being mean to Krystal! Her voice is just fine. Her voice might not be as strong as Luna, but it's not bad. Please be nice, and let EVERYONE have a fair chance at singing as well! It can't always be Luna.

Yea Krystal does sound like her sis when she tries to reach the high notes. But I think her tone is slightly lower than Jessica's? Both Chen and Krystal did well! Chen's starting is awesome!

Krystal really has a sweet voice

I can't breathe jongdae's voice is all up in me

her voice blend well with Chen's sweet deep voice. PERFECT DUET !

This song is not easy to pull off and I think both Chen and Krystal sand beautifully. So people please stop complaining about how Luna should be singing instead of Krystal or saying Krystal isn't as good as some of the other members. Krystal has clearly shown she deserves to be on that stage just as much a everyone else has.

Chen is soo good. Low note, high note, he nailed it all ✨

Luna has an incredibly powerful voice but Krystal has something so naturally sweet about her singing. This song was perfect for Krystal and despite what others may say about luna being a better singer, I look forward to Krystal proving to everybody that her singing talent should be respected.

Wae is everyone bashing Krystal?? Sure, her voice isn't as strong as Luna's, but it has a smooth, soft sound. And can't we be happy that SM decided to include f(x) for a change?? The singers are chosen and there's nothing we can do about it. Let's just enjoy the music~!!

I love how Krystal sounds exactly like Jessica when you close your eyes...

Krystal's voice is amazing

I like the way that Chen sing so sweet, it really blend very well with cute voice of Krystal.. again, in few moments, I thought Jessica is singing here.. hahaha.. sweetness overwhelming..

I may not be an f(x) fan, but I thought that Krystal's voice really went well with Chen's. They both worked very hard on perfecting those harmonies and I think it turned out great! :) They both sound amazing.

EXO CHEN the best voice.เสียงสุดยอดมาก เพลงก็น่ารัก

개인적으로 슴더발 앨범에서 제일 기억나는 노래 .. 진짜 세련된 노래인듯.. 지금 들어도 안촌스러움

I think they picked Krystal because her voice really suits the Japanese language. It sounds a lot more light and cute than Korean or Chinese. Krystal's voice fits that perfectly in my opinion.

Krystal sounds like Jessica. same sweet voice

Krystal did a wonderful job and so did chen. Now don't you people go negative cuz I doubt most of you could do any better. Now good day. Farewell Comment section I am scared to read because there might be hate...

Krystal's voice is heaven

I LOVE KRYSTAL

진짜 이 오빠 어떡카냐 오늘따라 더 잘생겨보여.ㅠ 아 검정수트 어떡케진짜진짜 아ㅠㅠㅠㅠ

I swear, almost every idol that is a boy i see with Krystal, the chemistry is always there. How can Krystal always do that?

I hope Kai and Krystal can also have a collaboration like that.

Wow Chen is just so great

항상 사랑하고 노래 불러줘서 고마워 종대야♡

baby jung's voice has improved so much!

in love with krystal's voice

Krystal's voice is perfect for harmonizing. If u listen to f(x)'s tracks u can always hear her voice on the background. Her voice is just so delicate that it fits perfectly. Listen to goodbye summer and listen amber's part. It's amazing

Chen gives me an indescribable feelings..

English Translation: I didn’t want much, you were always by my side The way you talk and your smile always made me smile I didn’t hate it Really? I didn’t know because you always smiled as if you were a little annoyed Look at my eyes, do you mean it? Sometimes, without even knowing, I think of the cold you It’s strange how my heart races One season, two seasons pass and it’s been a year But the thing I can’t forget Is the sound of your laugh whenever I talked Really? I didn’t know because you were always frustrated with me You were always pouting and mad, it was so cute Sometimes, without even knowing, I hear your voice in my ears I try to cover my ears but it’s no use How have you been? I’ll ask first I’m… doing really well Stop lying Although we don’t know everything about each other… For me, it was good How we used to care for each other For me, it’ll be painful Even when the seasons endlessly change But it’s alright, but it’s alright

The way Chen stares at Krystal makes the song even better.

Krystal voice are smooth and sweet !! Krystal and chen voice blend so well ! My favs song from breath album tbh

lol, so we're not going talk about how proud we are of our Chencing Machine?

Everyday chen looks more handsome how is it even possible-- ugh jongdae i love you

Omg! This is my fave track in SMTown Superstar game! Never thought it was sung by Krystal and Chen

Chen is such a gentleman. He lowered his tone for Krystal. Aaaa I love him so much❤

OMG GUYS. LUNA'S VOICE IS FOR STRONG SONGS, KRYSTAL VICE IS FOR SLOW SONGS SO SHE FIT SONGS LIKE ,GOODBYE SUMMER BY AMBER, STOP BASHING JESUS

Such a sweet song from Chen and Krystal ^U^ I really enjoyed their vocals together and despite Krystals facial expression (Ice princess stare LOL XD) Her voice is very beautiful, Chen's as well^^

진짜 좋긴 좋다..아직까지 듣네

Jung SooJung You're great, I love your soft voice, you're the right one for this project. f (Krystal)... FIGHTING....!!!

Can we just take a moment and comment on how amazing Chen sounds?

go krystal we are here f(x) fans to support you even my ub is sulli but f(x) is a family right so we are always here for all of you as a family

I just love it when Krystal sings:)

It's nice to see Chen showcase his more tender and delicate singing. His vocal range is so impressive. He can either be a powerhouse, belting out the highest notes, but he could also sing gently as this song shows. His voice complimented Krystal's delicate vocals. This is a sweet and lovely song. Love it!

Krystal voice very soft

Krystal is literally perfection.

Chen's collaborations with anyone are great and even his own solo or station or ost or anything. Chen's voice is angelic. Lovely Chen 💜 fighting!!

krystal's voice is so sweet :x she can sing she can dance she can act she can do everything and she is so pretty :D gosh!! such a perfect girl :x

Soojung my bias you're really great how amazing smooth gorgeous tender sweet voice you own!!! always love u fighting!!!!!!! best vocal forever in my heart

chen's voice is awesome!:)

Chens solo album is what i need rn

the way chen looks at krystal melt my heart..omg!their voice blend beautifully and so harmony thanks to chen kindness by lowering her voice and krystal soothing voice

Chen baby

krystal your voice just melts me >< chen ah you too! both voices combine together makes perfection

krystal so sweet 💖💖

Krystal is so beautiful ajd her voice is super sweet tooo!!!!

I miss this song.. this moment.. the drama MIMI..

CHEN~

KIM JONGDAE's voice is so sweet as well as KRYSTAL's.

Kystal's soft and sweet voice + Chen's angelic and powerful voice are so good together. Saranghae, f(exo) fighting!

I'm falling even deeper for Jongdae if that's possible

This song is sooo sweet. Chen's voice is soo sweet and Chen and Krystal is sooo sweet T.T

OMO. I NOW SHIP THIS TWO! CHENSTAL ♡

This group's combining voices are perfect too! Chen's voice can be powerful in BREATH but also soft and sweet in this song! Krystal did a good job in this song too! First love song for me in this album is Breath in Chinese ver. And second is this song, I'm not a Korean so I don't know the lyrics meaning, if I didn't check the lyrics, I really thought that Chenstal were singing a love song!

Beautiful duet! Love their voices together!! I'm such a huge fan of Chen's vocals but I think Krystal sung wonderfully as well:)

ยัยจองงงงงง เสียงหวานมากเลย >////

They look so adorable together *_*

this is an awesome duo for a sweet coupling song! =D i liked how SM planned it so well with sorting the ideal couple for each song.....awesome!

love soojung!!!! people always complaining!!! just support each other members.. soojung's voice is so comfortable to listen to.. it suits the song..

Chen's voiceeeeee :((((((( Krystal's is smooth. She's so cute :33

Her boyfriend is Kim Jong In, and she's collaborating with Kim Jong Dae. It seems like she's destined to be with the Kim Jong''s brothers XD

Fallin' in love with Krystal's voice ♥♥

Chen and Krystal's ❤️❤️❤️❤️❤️❤️

this one is better than the recording version. i love it!!

im from 2023, chen u did all so well

Asdfghhjkl ChenStal's voices go so well with each other! >< I'm really glad that SM picked Krystal to be in SM the Ballad, since she's usually known for her looks and acting but not her singing, and Krystal finally gets to showcase her vocal talents :)

너무이쁘고잘생겻쟈냐~~~!! 너무슬퍼나오언냐처럼예뻤으며뉴ㅠ

Krystal why so perfect

종대 음색 너무 좋아ㅠㅠㅠㅠㅠㅠㅠ

Krystal you so beautiful I love you ahhh

krystal reminds me of sica's voice alot ♡

ah~! I love this duet

Jongdae voice in the beginning is so beautiful ❤

This was actually the duet I was most excited about! I think the song & both singers are cute as hell! Of course, the other songs didn't disappoint as well, especially Chen & ZLY's 呼吸 (Breath)

WHY TF SM THE BALLAD IS STILL NO WHERE TO BE FOUND ON SPOTIFY ???? anw, can sm pls bring back sm the ballad.