I'm not really liking this "kidnapping - losing memory - revenge" plot... I thought, from the summary they published, it would be a love/hate relationship like in "You And Everything Else". But I'll keep watching it because I still think it’s a good story, just sad that they went in that direction....
Why are people hating on Pi-o? Imagine growing up seeking validation and being ignored all your life and all you…
Furthermore, that person has a natural talent, he doesn't struggle at all. Pi-o, on the other hand, even if he's good, has to try really hard. So it's even more understandable that he feels jealous, even if Jeong Yo is his friend and he loves him.
It's not clear, they develop an interest in each other, but the book doesn't say anything about them becoming a couple. They closed the circle with their ex lovers, so I think, if they ever get together, will be up to the readers
It's from last year, but The First Frost has an amazing soundtrack, too!
Oh, and there's another drama that is very slept on, I think not many people knows it, but it’s from last year as well, is called "Be Passionately in love" and there are two OSTs that are incredibly beautiful, I still listen to them a lot! The titles are: 1) Billions of Sky Falling Stars (sang by the actor in the drama, Wang Anyu) 2) Crush (by Zhou Shen)
K-Drama 
1) Billions of Sky Falling Stars (sang by the actor in the drama, Wang Anyu) 2) Crush (by Zhou Shen)