It's just misery porn and in the end, they end up together.
Unbelievably clichè.
I don't think the characters have as much depth as many readers here seem to claim, which makes me wonder: What kind of webtoon have you guys been reading, if you consider this sort of story and its characters complex?
A story can affect a reader's emotional state without it being complex or well written. That's what misery porn does. But i guess this is only my opinion.
On the other hand, i really love the art, especially the way the eyes are drawn, so kudos to the artist.