After I receive spoiler I read the novel continuously.
Spoiler!
First someone worst and saddest moment will happen (drama time)
Second someone will die (Jaewoo will died and return to his real world basically his friend kill him)
Third Jaewoo friend and Jaewoo friend sister have power. (The reason why he is inside the book it is because of his friend)
Four in the side story they are talking how Mujin suffer when Jaewoo die and accept the fact that Jaewoo love Hyeonjin. Also in the side story there have H scene which funny because they are first timer. Basically they will skip it because it is shounen Ai. Also in last side chapter time past when the child become grow up and creating family picture which is the parents are Jaewoo and hyeonjin
Second someone will die (Jaewoo will died and return to his real world basically his friend kill him)
Third Jaewoo friend and Jaewoo friend sister have power. (The reason why he is inside the book it is because of his friend)
Four in the side story they are talking how Mujin suffer when Jaewoo die and accept the fact that Jaewoo love Hyeonjin. Also in the side story there have H scene which funny because they are first timer. Basically they will skip it because it is shounen Ai. Also in last side chapter time past when the child become grow up and creating family picture which is the parents are Jaewoo and hyeonjin

