He didn't, it was his sister, accidentally... Trish.Nog.
Ah now that u mention it! She did . But the thing is jaewoo said that the character and him have the same name, so maybe he wanted to put jaewoo with in this fictional world and trap him there; but haha the sister was one steep ahead and he had to rush things out to get jaewoo back
So he put jaewoo in the fictif world and now he's not happy that jaewoo wants to go back? Like why did u put him there in the first place bro