Responses

He thought she was delirious and invented everything, after the first letter, apparently after her death her letter or something else had a clue that convinced him she was telling the truth about actor being the one who fooled her, and to apologize for not believing her, he is doing it
I hope there is some pretty convincing evidence that actor knew her and was aware of the bullying
everything indicates it was that half korean girl but to MC she didn't have any contact with his friend so it would make more sense to be the actor
Well I just don't understand what fucking REVENGE he's after. Like really? Revenge for what? For not knowing your mentally unstable friend? bruh please. Take revenge on yourself then, you're the one who wrote those letters which gave her false hopes.