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

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

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

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 ^_^

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

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

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

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

Krystal you so beautiful I love you ahhh

둘 다 목소리 왜이렇게 예쁠까..

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

종대짱♥♥ 크리스탈 가사 다못외웠나봥ㅠㅠ 밑에 가사나오는 화면 계속보는듯 둘다 홧팅♥♥

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..

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

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.

Krystal รักคริสตัลมากๆเลย เสียงไพเราะจัง

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

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~!!

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?🙋🏻

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.

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

수정이 목소리 참 예뻐..

i like krystal's voice

크리스탈♥♥

EXO CHEN the best voice.เสียงสุดยอดมาก เพลงก็น่ารัก

진짜 좋긴 좋다..아직까지 듣네

baby jung's voice has improved so much!

음처리도깔끔한종대♥

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!

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

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

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.

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

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

I LOVE KRYSTAL

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

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.

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

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

너무좋아요엑소♥♥♥♥♥♥♥

CHEN~

Krystal's voice is amazing

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

Krystal sounds like Jessica. same sweet voice

Krystal why so perfect

That awkward moment when i only see comments defending krystal but no comments bashing her.. O.o

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

Chen baby

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.

그냥 타고난 가수인듯 노래부를때가 쩨일 멋있써♡♡♡♡♡♡♡

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...

♥ 둘다 이쁘네요

Krystal

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

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

완전잘어울러bbb

chen's voice is awesome!:)

Krystal really has a sweet voice

You are so beautiful my Krystal :*

Jongdae voice in the beginning is so beautiful ❤

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.

Chen and Krystal's ❤️❤️❤️❤️❤️❤️

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

Jongdae you should do more collab with female artists .

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

종대 음색 너무 좋아ㅠㅠㅠㅠㅠㅠㅠ

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

종대 짱이쁘다ㅜㅜㅜㅜㅜㅜㅠㅠㅠ

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

둘다 음색 개꿀♥

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

진짜 이쁘고 멋지당~

Wow Chen is just so great

Haters bash Krystal because she is pretty and have many of fanboys right??!!Why?!..Krystal is good!!Stop bash her!!..i don't think her want close for idol male..I think idol male want close to her because she is pretty and perfect!!F(x) fighting!!

Chenstal ! perfect duet

That awkward moment on the 2nd chorus where they both sang the harmonies thankfully Chen realized it and switched to sing the melodies lol anw they sounded so good together

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

크리스탈 짱!!!❤️

Krystal's voice is heaven

종대오빠의매력에반함~❤.❤

I seriously dont see the point of bashing krystal. Her voice is perfect for this particular type of song. If anything, it was chen that was misplaced here. Now dont get me wrong, hes an absolutely amazing singer, but you can clearly see how his potential is not fully used, thus he tends to pull back during the song. I somehow imagine someone like jonghyun to sing this. But hey chen still pulls it off like a pro he is, and seriously guys stop bashing just enjoy the song ^^

대박 첸멋죠영 크리스탈예뻐요

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

Fallin' in love with Krystal's voice ♥♥

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

Krystal is literally perfection.

People! Not because one's voice is powerful they're a good singer. Luna's voice is powerful... she's good but she's not flexible so she can't sing this song it wont give out the same feeling. Krystal on the other hand has a sweet angelic voice, she nailed this song and she conveyed everything in the right way. Now if you think powerful voice cant have angelic voice and not be flexible... you're wrong Taeyeon has a powerful voice but can also have angelic and soulful voice. She's that flexible and she perfectly knows conveyance. You might think im ranting or comparing but its necessary... you guys keep bashing on Krystal when she clearly nailed it. You should stop it, give her credits for doing a great job. They all have skills, they're good... but they all have different area of specialty you should acknowledge that.. they can't be good at everything.

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

완전좋다♥크리스탈이랑첸완전이쁘고 잘생김bb

krystal you voice cuteee

항상 사랑하고 노래 불러줘서 고마워 종대야♡

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

종대 너무 보고싶다

Love Chen's voice and Krystal soft voice

크리스탈 사랑해♡

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

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