Confidence. That's huge as an actor. Confidence can get you a long way. Maybe it's a cultural thing, being Korean, but my first reflex has always been to exude humility - but it doesn't help you in acting. For acting, humility isn't the best thing. It'll weaken your work. So it's a head game for me. "Can I really be confident in knowing my skill set is down? Can I perform like I own this role?"

I know a lot of people who say, "I reluctantly watched the first episode because I don't really like zombies and that stuff, but I was pleasantly surprised by the characters and the drama of it all." I think that's what keeps people coming back and brings new watchers to the show. What the show does is cross many, many different viewerships.

The most fun thing about doing the show is that, as a nerd, the fun has been in learning and having it be like a grad school for me, every day. Every moment is a new experience. Every conversation is a new gain.

What I learned, in the two months that we shot, I don't think I could have learned in two to four years of drama school. It's invaluable to me, and that's been the most fun. It's been nice to let this be a learning experience in everything.

Having read the source material, I had to have drawn from that. As a fan, I wanted to remain true to that character, but it was really cool because, as we were figuring these characters out, I realized that there was a lot more backstory, rather than what I had gotten just from reading the book. Glenn doesn't really get much of a backstory there. He's just seen as this kid who is put in this situation, not knowing where his mind-set is, but then you slowly see him start to develop.

To be honest, at that point, just being so fresh to L.A., I was in the mind-set of just getting work, at all costs. But, if you take a step back from it, it's just such a blessing to be able to play somebody like Glenn. Me being Asian American, it's nice to have something to play that's not so very stereotypical. It's also nice to have somebody that I identify with.

I took up boxing to get in shape for filming because it's grueling - all the running, the heat, the yelling, the crying that we do.