Responses
Spoilers...
By some some magic Jaewoo transmigrated into the novel to hide himself from that obssessive friend of him who comes now to pursue him, but then after all the events we see, he dies in the novel and comes back into real life. Since he's not happy and gets depressed, will ask to return in the novel to be with Hyeonjin once again...

I don't like the other new character. He is an unpredictable element here, so like he didn't actually died in the real world where he used to live in...? Jaewoo I mean. So like he stuck into the novel... But if its that... Why did I understood that he got reincarnated into the novel. My brain (/TДT)/