Jennifer Ka

There is no older man in a relationship with a younger girl/woman in this drama. It's a drama about the friendship/hate ship between two woman. The boy, man in the first episode is not in a relationship with the girl. He is just nice to her and when you watch more than one episode you will see that he dies pretty soon and is actually a trans woman.

There is no pedophile love in this one. You should watch more than one episode.

I also thought he looks a little bit like Choi Woo Shik.

Try 'Gu Family Book', it's a fantasy period drama