KO One

The sound of Ding Xiao-yu playing the piano dissolves the tension. Da-dong lends out a helping hand when Arthur's father is in danger.

On the way back from visiting her brother's tomb, Tian Xin is kidnapped and forced to resign her teaching job. Da-dong's buddy returns to the country.

Jin Bao-san witnesses a side of Lei Ke-si that is unknown to others, but Da-dong calls on his classmates to take side jobs to help pay Ke-si's debt.

Lei Ke-si goes out of his way to please all the teachers and classmates while framing Arthur, making it difficult for the latter to reveal the truth.

An unexpected visitor turns up at Da-dong's house. Dean Jia Yong and Lei Ke-si both want to turn An-qi into their pawn.

A madly jealous Lei Ke-si continues to mislead An-qi as he tries to take this opportunity to confess his love to her. Arthur devises a scheme.

Lei Ke-si finally shows his true colors and launches a surprise attack on Da-dong. The two fight fiercely, yet one of them stops at the last moment.

Da-dong and An-qi gets back together as a lovey-dovey couple. A difficult decision awaits Tian Xin after she gets a new boyfriend.

Da-dong begins to rebel against the homeroom teacher and reverts back to his old aggressive self, which arouses the suspicion of An-qi and Arthur.

Da-dong wants to embarrass Shao-zong, who ends up winning the admiration of his classmates. Tian Xin uncovers the truth behind Shao-zong's exhaustion.