Mind you most of the things Sang Yan has done for her he never outright told her he did it. So how would she know?…
I think your arguing with the wrong thing here. They are just stating that you didn't quite understand the character of Wen yifan. And you did quite literally asked if "her Trauma has made her dumb?!". I don't think anyone will defend "their" drama if you didn't like the story or the characters but you stated that you were a fan of the novel and said that the drama is not as good. And Wen yifan's character is actually not that hard to understand. yes, they were close in high school and yes, he still cares for her. but you have to look at the situation from her perspective rather than the whole picture. She thinks that she hurt him in the past, which she did, even though she didn't want to. and the male lead cared for her indirectly and now, she appreciates all the things he's doing but is still guilty of the things she did to him in the past. She also has "trauma" about being abandoned (which is, yes, quite important and real.)