At Eighteen

Not long after arriving at a new high school, where he's shown around by star student Ma Hwi-yeong, Choe Jun-u faces an unfair accusation.

Jun-u prepares to transfer schools; Yu Su-bin doesn't believe Jun-u took the watch; Hwi-yeong won't own up to what he did.

Jun-u beats out Hwi-yeong to pair up with Su-bin for a class assignment; Jun-u receives an urgent call about an old friend.

Su-bin and Jun-u continue practicing their English for the upcoming evaluation; Sin Jeong-hu writes a letter and makes a heartfelt apology.

Jun-u's outburst of rage panics Hwi-yeong, who has something to cover up; O Han-kyeol visits someone who can testify to the truth.

Su-bin is fighting with her mother and doesn't go home; determined to reveal Hwi-yeong's true nature, Jun-u starts to gain insight into his behavior.