Da-dong’s memory is in disarray. Ling reveals his identity to Da-dong and explains what has happened to him.

Da-dong gradually loses his memory. Class KO One prepares a surprise for Da-dong, who is determined to win the competition for the class.

Lei Ting decides to tell Da-dong her feelings, but someone spoils the mood. A man descends from the sky and calls Da-dong’s name before passing out.

Lei Ting finally tells Da-dong about her feelings. Wan-jun beats up Da-dong for Lei Ting, yet Da-dong seems to have changed into a different person.

Class KO One is shocked when the identity of the kidnapper is exposed. Lei Ting realizes her own feelings and those of Wan-jun.

Due to a strange combination of circumstances, Lei Ting and Da-dong are trapped on an island and forced to spend a night together.

Wan-jun feels bitter as Lei Ting cares more and more about Da-dong, who receives a bizarre warning.

The identity of the “Non-existent Student President” is finally exposed! A mysterious person confronts Da-dong and knocks him out.

Romantic feelings are growing between Lei Ting and Da-dong. What’s-his-name discovers an unknown side of his father. Xiao-jie is staying at KO One.

Lei Ting causes an misunderstanding as she tries to stop Xiao-jie from a wrongdoing. Hoping to find the truth, Da-dong sets out to look for evidence.

Da-dong’s ballots are burned, but he is unwilling to accept defeat. Just at the nick of time, he covers up for Lei Ting.

Not being able to understand the good intentions of Da-dong, Lei Ting keeps fighting with him. A mysterious girl shows up at school.

Upon learning of Wan-jun’s secret, Da-dong asks an old classmate to help. Ling-ling is in a critical condition, which forces Wan-jun to make a choice.

Unaware that he has become a spoiler, Da-dong takes part in a school election. Huang Fei, the class teacher hates Da-dong more and more each day.

After falling through the crack of time and space, Da-dong finds that everything familiar has changed. It turns out that ten years have gone by.

The new boss of class KO One and Da-dong are at odds with each other. While chasing a thief, Da-dong accidentally sees a secret that cannot be told.

Gifted with special powers, fighting skills and slick hair, the rowdy KO One navigates tough friendships and high school romance.

Arthur becomes so delirious that he wants to harm those around him, but a powerful force of energy stops him at the critical moment.

Arthur must face a stern challenge. Wu-xiong’s body is rapidly aging. A familiar face returns.

Da-dong’s parents are missing, now even Arthur’s father disappears for no reason. Everyone prepares for a battle of life and death.

Da-dong sets out to advance his fighting power. Arthur becomes unusually short-tempered after being injured by his own sword in the stone.

Two sisters transfer to the class, and the younger one falls in love with Arthur at first sight. The new teacher puts the class in an uproar.

A comic set that predicts the future is about to be reprinted, which not only attracts great attention, but also people who intend to kill the author.

The class teacher leaves without a word. An-qi comes over to comfort an unhappy Da-dong, who loses consciousness in an instant.

Da-dong receives a letter from An-qi. Being taken by surprise, he acts in a flurry and falls prey to Hei Long and Wu Shi.

The entire class comes up with an idea to help Shao-zong reconcile with his biological mother. An-qi and Xiao-yu seem to be more than friends.

A mystery man appears multiple times but leaves each time when Tian Xin arrives. Da-dong’s pastor dad has been hiding an astonishing secret.

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.

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.

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 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.

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.

The class “KO One” takes students with all kinds of issues. This semester, a transfer student tries to vie for the “boss” position with Da-dong.

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.

An edgy sexy thriller about an innocent college boy and the woman who would introduce him to manhood. Alex meets his new sultry neighbor, Rose, who awakens his sexual desire…

In his 40s, the stuntman Woo-seok wishes to go back to the prime of his life in 1997, before a facial scar ended his acting dreams. One day, he purchases…