I got lost somewhere down the line

This started out strong but somewhere in the middle I lost interest. Towards the end I felt some of the characters were acting in a very OOC way. Additionally, the ending felt a bit rushed. In my opinion, it could have been better developed. I will say though, one of the reasons I kept watching was because of Kim Min Gue and his character's relationship with Young Seo. Overall, I found myself feeling disappointed towards the end.