This is the bad kind of melodrama. Not a single likable character. People calling it mature but these characters are the farthest thing from being mature. It had the chance to be different. For a second I though they wouldn't force a break up but it went with the classic melo move. By episode 9 my interest was almost nonexistent.

Exhausting melodrama full of oppositions and lacks proper balance. But what's even more exhausting is the unbelievable frustration of seeing female lead running away repeatedly non-stop.
From start to finish she kept running and pushing ML away, I'm beyond done with this immature behavior.

They introduced Park Shin Young in the second half because there wasn't enough "story" remained to push for another 10 episodes. Her existence brought the drama down even further.