IU&Seulong...

yes....SEUL LONG AND IU, THE BEST!!!!

IU&Seulong

Seul Ong&IU is the best. I like their voices!

Seulong & IU

iu and seulong performance!!!

IU and Seulong! :) Their technique and voice color have a lot in common, it make their voice blend very well... also their voice range pretty similar.. Sunny's voice is good but still need more support and warmth in high notes..

iu is the best..

iu & seulong ^^

IU and seulong :D iu have soft voice

IU and seulong as expected of course!!!

IU&Seulong best

IU and Seulong the best combination!

SEULONG AND IU IS THE BEST

iu n seulong!!!!

Of course iu and seulong👍

Iu and seul long

Seulong&IU♡♡

In this case, IU and Seulong. On another note: When I hear this song...it takes me back to watching Reply 1997 and I would love to hear Seo In Guk and Eunji singing it...I bet they would provide the powerful notes, the songs needs.

IU and Seulong

Iu and Seulong their voices blends together ...

Iu and seulong forever!!!♥️♥️

SunSun♥

I love SunSun!!!

sungmin and sunny ~

Sungmin and Sunny :>

SUNSUN

Though I LOVE SunSun, I've to admit IU and Seul Ong are better singers.

I`ll share my own opinion ;) I think that from the first two couples I prefer Seulong and Sunny, because he has a deep and soft voice who`s a good background for the high ton of Sunny. But between Seulong-Sunny and IU-Seulong, I prefer the IU duet, because her voice is not outlined against the voice of Seulong, despite the high tones. Their voices are making a good chemistry.

Honestly,you should have included Sunny and Seulong their duet is the best.

♥（ﾉ´∀`）Sungmin Sunny

Sunsun’s version is definitely the best over here. IU’s voice could be stronger.

Oops sorry I thought you were only comparing SunSun and Seulong and IU .

Seulong & IU

IU &Seulong

Seulong & IU...