Seong Gi-hun: I wanna know why you joined us?

Oh Il-nam: Oh, well, in my childhood I always had so much fun out doing things with all of my friends. We'd lose track of time for hours. I wanted to just... feel something just one last time before I die. And you are not going to get that feeling if you are just going to spectate. And I desperately wanted that.

Seong Gi-hun: And so... did playing do that then?

Oh Il-nam: Hell yeah. You asked why I let you live. By joining and playing with you I got that chance to feel again. Thanks to you I got to remember all these things that I had forgotten long ago. It had been such a long time since I was able to have that much fun.