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.

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.

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.

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.

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.

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

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.

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.

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.

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.

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.

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.

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.

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.

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 is unhappy. Qiu Qiu is looking for a missing item, but Ling misunderstands and discovers that there is a deeper tie between them.

Everyone in KO One tries to pull out the best tricks to help Qiu Qiu pass the test. Qiu Qiu wants to lend her ring to Ling, yet he turns her down.

Lei Ting begins to see hallucinations accompanied by severe headaches. Wan-jun's house is burned, while Ling's tent is also being trespassed.

Lei Ting must confront the past that she has been reluctant to face; her past with Wan-jun also comes to light.

The sealed memory of Lei Ting is unraveled, but the truth breaks her down and drives her to tears. In order to protect her, Wan-jun makes up a lie.

Lei Ting reveals the secret to her classmates and reconciles with Wan-jun. The class is in danger. Luckily, the new transfer student saves the day.

Ling and Wan-jun work together to investigate Geng Lie. Wan-jun rushes to the rescue when a debt collection group forces Qiu Qiu to work off the debt.

Wan-jun decides to break ties with Lei Ting. Geng Lie saves a girl who keeps calling him "King Arthur" despite having lost her memory.

Wu-xiong tells Geng Lie about her love for him, but it only makes his heart ache. Lei Ting shows her affection for Wan-jun, who feels rather mixed.

In order to bring King Arthur back, Wu-xiong decides to look into the memory from ten years ago. The spell imposed on Lei Ting is lifted.

Lei Ting and Wan-jun decide to face the future together. To protect the two of them, Hua Ling-long pulls a risky move.

Everyone thinks it's too much when Hua Ling-long goes after Qiu Qiu. With the raging epidemic virus, the Gold Dimension might be obliterated!

While facing off with Professor Pang, Lei Ting stumbles on an unbelievable truth. Prof. Pang goes so far as to destroy the Door of Time and Space.

The end is near, and the virus is spiraling out of control. Professor Pang feels a strong sense of regret, but everything seems to be inevitable now.

The KO List undergoes dramatic changes. Da-dong is assigned to return to class KO One to investigate, where he reunites with the teacher, Tian Xin.

Da-dong and Wan-jun are ambushed as they investigate the reason of the abnormal fighting count. Lei Ting cannot tell how she feels about Wan-jun.

Everyone is shocked when the new class teacher shows up. A letter Lei Ting receives prompts her to confront the past and face the future.

The class is on the verge of conflict as three ill-intentioned mysterious characters transfer into KO One. Someone issued Lei Ting a duel challenge.

Da-dong suddenly intervenes when Lei Ting and Gu Zhan battle against each other. The magical power of Li Yan-yan makes What's-his-name uneasy.

What's-his-name wants to win Li Yan-yan's heart, but things do not go as planned. A puzzled Da-dong has no choice but to seek help from Lei Ting.

Da-dong receives a critical phone call, which is hung up by Yun-han. Soon after, the cellphone suddenly disappears.

Jin Bao-san is heartbroken. Lei Ting and Da-dong accidentally discover an unknown side of What's-his-name.

Everyone in the class receives an invitation. Wan-jun becomes aware of Lei Ting's feelings. An unexpected visitor turns up at Bale High School.

Hua Ling-long tracks down the druggie, and the recording of the drug deal also comes to light. The worst devil in the history of KO One turns up.

Da-dong and Lei Ting become closer, which makes Wan-jun jealous. Zhi Ge's father discovers why he is reluctant to take his girlfriend home.

Wan-jun suddenly professes his love to Lei Ting. Jin Bao-san is hypnotized and attempts to assassinate Da-dong, but ends up injuring himself.

Da-dong adopts the experience of others in order to understand how he feels. Despite the urging of Gu Zhan, Qiu Qiu continues to fall for Wan-jun.

Zhi Ge discovers a talking door. Hei-long secretly sneaks into Bale High school. Gu Zhan accidentally uncovers a certain truth.

Zhi Ge starts to question the real identity of Secretary Li. Zhi Ge's father begins to look into the case, but ends up falling into danger.

Hei-long forces Zhi Ge to open the broadcasting room's door by holding Gu Zhan hostage. Everyone is horrified after the seal is accidentally broken.

Wan-jun shows signs of amnesia, but there is nothing Lei Ting can do. Da-dong is finally back, yet someone barges in just as he is about to help out.

Gu Zhan rushes to the hospital after being notified that his mother is critically ill. A fight ignites the internal strife between the brothers.

There is a remedy for Wan-jun's symptoms, but he will have to pay a great cost. Da-dong refuses to believe that his father has been demonized.

Zhi Ge is taken by a mysterious figure. Gu Zhan strives to save him, yet Hei-long appears at this moment, and he seems to have something planned.