I like Ki Bum, the character, because he is so cheerful. If my previous roles were serious and suffering (?), this time around, it was portrayed as a healthy 23 year old. I have been wanting to show that side of me. The characters I play do influence me personally and while portraying this character, I thought to myself that I should try to be healthier. Of all the features that is in me, it (the role/character) probably is the highest of them. Cheerful and high spirited part of me is shown.
I think every actor should have what is unquely his own. If anyone can play my role, I lose my existence (presence). Yoo Ah In (as an actor) needs existence (presence). I want to be the actor with his own unique presence.
Can’t find the original source. Credit Translation Rxgoodleaf @ soompi