When I get really stuck, I switch to something I haven't watched for a long time. You've only mentioned chinese and korean dramas in this article, so try to switch it up for something taiwanese or thai. Taiwanese shows are normally lighthearted with a lot of humor and thai shows are so dramatic that you can't take anything seriously, so in turn it becomes really funny.
There was a scene where there were strange noises when she was on the bed. It almost seemed like maybe she had been raped and that was what made her have mysophobia. That was why she felt like everything was dirty and that was her wall was almost bleeding. The ending scene showed a face on the wall too, so her scar was a person not that she missed, but wanted to get rid of.
Only reason why it didn't get a 10 from me is bc I was unsatisfied with lack of sweet scenes we were given of…
I loved it that whenever she called him, she imagined him there beside her. It was like hearing his voice wasn't enough, but he had to be beside her too.