Well, it's not a abusive relationship shoujo ?
But it seem familiar with me. love story with one of them is rich, and the parent won't allow it. guess since in my youth tv show nothing but drama and soap opera like that. only 1 chapter but i don't think a engagement in there for nothing.
And also don't know but i already figure out a ntr scene. guess because it is familiar shoujo trope, and he deaf help a lot