Ohh i think i understand what's going
Huimin has 2 personality , so he thinks he is in the novel which is not. Like cut off his memories , but other personality he remembers. Su Iheon knows everything about him that's why he changed. So Huimin has trauma , this is why Iheon wants rid off his paintings.
"I AM NOT INTO MEN BUT " - Him touching him and kissing lol
Noooo i meant to upvote LMAOOOOO THATS SO FUNNY