I am so unsatisfied. This is the kind of plot that keeps me waiting for answers but never gives them. I don't get what the message of this drama was. It's just continuous pain, which I don't mind being the theme of a movie/series as life unfortunately can be quite painful, but this drama seemed to try to send a more positive message. I clearly didn't get it.
On the characters, I felt sorry for all of them and I don't think there were many people in this drama that didn't had me worried about there mental health.
Also (spoiler coming),
lost friendships are my weak spot and they really break my heart. As someone who cannot leave things unspoken, it left me so unsatisfied how, !multiple times!, these characters couldn't express their worries and pain better.