@Yuka I can't say for sure, but it feels to me like Mr. Kwon from "Our Sunny days." Even if I'm wrong, I'd still suggest you to read our Sunny days because its so good and wholesome and adorable.
I only want to live in fantasy, I don't like the real world..Yes, you're right, I think I have mental disorder too. So what, there's no sane person here. That's why I'm here.