Spoiler from the last chapter from yeonwoo,
basically yeonwoo gave up on haesol, but there is a person who comes back to talk to yeonwoo and haesol looks at yeonwoo talking to that person and then haesol arrives and was going to ask yeonwoo about that person but yeonwoo tells haesol if they can meet at Christmas and she says yes and that's where Yeonwoo tells Haesol let's break up and Haesol says what, that's where the chapter ends.
They are going to break up because yeonwoo gave up on haesol that's all I'll say. And another thing I will say, Yeonwoo realized that Haesol will never have feelings for him :|