Bai Han Qi, Bai Luo Yin's father, accidentally throws Luo Yin's underwear to the drain. Luo Yin then informs his friend Yang Meng that his mother (Jiang Yuan) is getting married. Meanwhile, Gu Hai is conflicted on deciding to whether or not attend his dad's remarriage ceremony and approaches his girlfriend, Jin Lu Lu, for advice. He later has dinner with his dad, Gu Wei Ting, and his future new stepmother Jiang Yuan, but the dinner soon turns sour as the father and son quarrel. Luo Yin ignores his mother when she advises him on his future education, and she is later scolded by Luo Yin, leaving his mum in tears. Gu Hai moves out from his home and seeks his older sister on relocation. Both Gu Hai and Luo Yin report to class but notice that their teacher resembles Jiang Yuan (mother for Luo Yin and stepmother for Gu Hai). Gu Hai was punished by the language teacher for submitting a blank homework assignment, and so, Gu Hai tore Luo Yin's homework out of his workbook as revenge for his unique handwriting which Gu Hai doesn't like. Gu Hai met up with his friends Li Shuo and Zhou Yi Hu.
You Qi receives a gift from his admirer, but mistook that the gift was from Luo Yin. Han Qi accidentally washes one of the remaining 2 pairs of Luo Yin's underwear, but when he receives a box of new briefs and a box of medication, he suspects someone from his class is shadowing him. When Gu Hai tells Luo Yin that he was the one who gave the gifts and that he was the one who tore out Yin's homework (apologizing for that as well), Luo Yin stomps out in anger. Later, Gu Hai changes his seat to be behind Luo Yin, and he starts to plan revenge by cutting some holes out of the school jacket that Luo Yin wears. During the class physical lesson, Gu Hai impresses both his classmates and his teacher by producing 106 push ups in a minute.
Gu Hai beats his physical teacher's by doing more than a hundred pull-ups. Luo Yin plans his revenge against Gu Hai by sewing his school jacket shut, resulting being sent out by his math teacher for creating a ruckus. But during their English language lesson, a sleeping Luo Yin accidentally chided his teacher, thinking that it was Gu Hai who disturbed him. With several revenges acting amongst Gu Hai and Luo Yin, Luo Yin plots a new scheme by buying mechanical oil and locking the classroom doors. Unbeknownst to Luo Yin, this act would ultimately make him look bad as Gu Hai calls the school's principal in the class while telling him on a sticky note that it was Luo Yin who ruined the doors. The next day, Luo Yin receives breakfast after arriving to class and thinks that it was an act from You Qi.
Gu Hai gets two sleeping pills from the school's doctor and puts them into Luo Yin's water bottle. Unfortunately, the cold medicine Luo Yin took in the morning is expired and that combines with the sleeping pills knocks him out unconscious in class. The next day, some jealous brat from another class , Wu Fang, barges in the classroom and starts insulting Luo Yin's mom, calling her a prostitute. Enraged, Gu Hai knocks Wu Fang down and starts beating him up.
Gu Hai sends Bai Luo Yin home after he gets drunk from drinking too much. When Gu Hai returns home, he sees his dad and refuses his request to move back home with his stepbrother and stepmom. His dad gets furious and beats him. Later, Bai Luo Yin invites Gu Hai to go fishing.
At the school, Gu Hai's girlfriend, Jin Lu Lu, is there, demanding to see Gu Hai. After school, Gu Hai invites Luo Yin to meet Lu Lu and three of them have lunch together. Lu Lu is jealous of the attention Luo Yin is getting from Gu Hai, but she gradually grows to like Luo Yin as he always deflects that attention back to her.
Gu Hai's dad goes to see Bai Luo Yin in hopes that he will accept the favorable terms he offers him. At the same time, Bai Luo Yin's mom, Jiang Yuan, goes to see Gu Hai to talk to him about moving in with the family. Unbeknownst about their family situation, Gu Hai who has moved in with Bai Luo Yin, sleeps on the same bed and goes to school together every day.
While playing basketball, Bai Luo Yin injures his leg and face by a fellow student, whom gets kicked by Gu Hai for injuring Luo Yin. Later, Gu Hai helps Luo Yin with his wounds. At night, Gu Hai tries to break the same-sex barrier with Luo Yin in the bed, which Luo Yin rejects. Gu Hai and Luo Yin visit Gu Hai's friends, Li Shuo and Zhou Si Hu, where he learns from them that Gu Hai does not like people touching him.
When Bai Luo Yin helps Gu Hai move, he meets Gu Hai's girlfriend, Jin Lu Lu. She goes into a fit of rage because of Gu Hai's response toward her attitude. The three of them have dinner together, but another argument happens when Gu Hai stands on Bai Luo Yin's side. Later, Bai Luo Yin's dad get a job promotion, and he suspects it was Gu Hai's doing.
Gu Hai helps Luo Yin's dad in getting a new job but Luo Yin is angry at him for doing so. Gu Hai breaks up with Jin Lu Lu after finding out that she is having an affair. When Ms. Zou's new shop opens, Luo Yin's mom is there and coincidentally, Gu Hai meets her . At last, Luo Yin and Gu Hai find out about their relationship. Out of rage, Luo Yin asks Gu Hai to move out.
Gu Hai skips school and drowns himself in alcohol from missing Bai Luo Yin. Meanwhile, Bai Luo Yin tells his dad the truth about their parents' relationship. Unfazed about the situation, he tells Bai Luo Yin to bring Gu Hai home. However, on his way to find Gu Hai, Bai Luo Yin gets abducted.
At Luo Yin's house, Gu Hai presents gifts for Luo Yin's family. At school, Luo Yin learns that in an upcoming medical examination, which includes genital observation, they will have to undress. Worries that Gu Hai will see him naked, Luo Yin asks the vice-monitor not to put them in the same group. However, during the medical exam, he ends up being examined at the same time as Gu Hai.
Yang Meng shares his trouble with Bai Luo Yin, resulting in him spending more time together with Bai Luo Yin and finding that he lives together with Gu Hai. Gu Hai gets jealous and throws a tantrum with Bai Luo Yin. On the other hand, Bai Luo Yin persuades his dad to marry Ms. Zou.
Luo Yin's dad remarries and Luo Yin is drunk from the wedding. Luo Yin cries and tells Gu Hai that he feels abandoned by his dad. Next day, Gu Hai brings Luo Yin to meet his cousin brother, Gu Yang. Gu Yang does not agree with Gu Hai and Luo Yin's relationship. Without prior notice, Luo Yin's mom is at Gu Hai's apartment. She tries to tell Luo Yin to study abroad but Luo Yin refuses.
Bai Luo Yin receives a call from his ex-girlfriend, Shi Hui, on Christmas Eve. The next day, Gu Hai finds Bai Luo Yin reminiscing the memories of them and gets jealous. Later, Bai Luo Yin is caught off-guard when she appears at his school.
