i dont understand it
i think sj is better actor than eric
forgive me if im wrong, i only watch him in ''spy something'' drama

why cant sj lead the drama?

Sung Joon, remodelling people? oh.
as to being second lead and getting the heart broken, he is so calm and collected he can take it.
I´d like the role to be challenging, fun and and original. doesn´t matter if it is second lead

I would like to see Sung Joon again, but not in another rom-com. The dude has talent, I was hoping he would stretch himself and go into another genre. I loved him to pieces in Shut Up Flower Boy Band, but could barely tolerate INR3 (it was a good drama, just not that great) and he did fairly well in the Gu Family Book as a second lead. He's already handled one rom-com this year :-( , just hope he won't get type-cast.

Anyway, here's hoping that it's a success - all things considered.

Oh no...my heart is already bleeding for him like it did for Dr. Yoon pil joo.

OOOF. This will be a tough one. They certainly know how to pick second leads that give the leads a run for their money. I would rather see Sung Joon as a lead in something, but I guess I'm just happy to see him back so soon.

I see some fan division here between Eric and SJ most likely based on how long they have been watching dramas. Since I found SJ's character in INR 3 way too smug -to the point where I couldn't finish the drama, I have no problem seeing him as second lead to Eric.
Absolutely cannot see it the other way around. As the facial similarity has been pointed out, there is a seemingly dispositional similarity
that the actors give off (superficial yet nearly tangible??? haha) and I can't see SJ getting the edge over Eric yet.

I am sure that I am in a very minority group but I think that Soon Joon should play a plastic surgeon who has some flaws, ie a very calculating man( but does not show his flaws to anyone) ,,, He played a guy who was super nice and perfect in INR3 but I also like him play a man who has some dark side. He is young but very talented as an actor and he should play different roles to expand his resume. Besides, I do not want to see his nice heart totally broken due to the appearance of the guy Eric plays. I like both actors!!

Oooooh and it just gets better O:

so our sung joon become second lead and he will broken heart......i can't watch it :"(

Sungjoon's destiny already been sealed.
but that is okay... I prefer Sung Joon as bad ass genius Choi Ji Hoon anyway.

I totally share your sentiment, jb. *sigh*

Sung Joon, I know you have your own solid reason to choose this project, but I'd rather see you in the lead.

This drama has so much eye candy, though. So, yay !?

if he is just wrapping up, someone quickly offer him a lead in something awesome and perhaps there is time to step out of this....

but on the other hand, we dont really know what he wants to do and cant interfere with the choices. if it comes from the heart

or it is just better to work than sit still.

Damn! First of all Sung Joon does not need to play 2nd to anyone anymore. He's proven more than once that he can generate heat with an icicle.