KDI-109, a male robot from the future, comes to live with Shin Ki Won's family. She is a girl who is studying in the philosophy department.

Su-Yun is student in college. She meets a boyfriend, Jun, in school. They love each other but Su-Yun has a secret. She has been in forced into a sexual relationship with her stepfather, Kim Yong. Jun tries to help Su-Yun to escape her father but Kim Yong attacks Jun and tries to keep Su-Yun. Jun goes to Kim Yong's house and fights with him.

Since 2 years ago, Haneul has been teased by Chiwoo who is a delinquent in his school. In the opening day of third grade, Haneul meets his middle school friend Myeongho who was moved from other high school. From that time, his school life had changed. He gets close with new friends, goes out with a girlfriend, draws cartoons, and enjoys summer time. While he enjoys a new happy life, things are suddenly getting wrong. Chiwoo prepares revenge on Myeongho and Haneul’s other friend Minsik who falls in love with Myeongho’s girlfriend. They provoke Hanuel into a fight because he is an easy mark.

En route to his hometown of Incheon to receive an award for his book about Mil-wol Island, where people have been known to vanish, author Dong-jo accidentally loses his bag. Needing to borrow money, he reconnects with some old classmates including his former sweetheart, Yoo-jin. Dong-jo is all smiles during his reunion until Ki-jung appears, and upon seeing him, painful memories flood Dong-jo’s mind. Not only was Ki-jung the cause of Dong-jo’s greatest childhood trauma, but he is also the biggest inspiration behind his new novel. Fate has apparently decided that now is the time for Dong-jo to fully confront his dark past.