Responses
spoilers
In the light novel (if my memory serves me right), Jiwook got into a situation and got injured, which led to him getting amnesia. The thing Jiwook did to Jooyeon was SAing him when they were kids after Jooyeon confessed his feelings. Jiwook also shared the video to Jooyeons mom, which caused her to become mentally unwell.

what im confused about is why did jiwook forget what he did? does he just have shitty memory or something? someone spoil me please