Su Yu runs into Mao Chong and Bo Kuang, who are still in cross-dressing after meeting with Xiao Ruo, while Wu Bi and Duo Duo buy food. Su Yu is thought to be flirting with a girl by the two, who rush to him with sullen faces. He tries to explain that it is Bo Kuang who has already returned to his original clothes, making Wu Bi and Duo Duo think he is fooling them.
Wu Bi’s father returns from abroad and immediately goes to his past wife’s art room, making Su Yu’s mother feel uneasy and disposable. When Wu Bi’s father asks if she goes to her stepson’s apartment, she admits that he is currently living with her son, which has enraged her husband. They arrive at Lao Si’s house and see the five of them cheerfully repairing their worn house. They confront and argue with Wu Bi, who refuses to return home. Lao Si steps in and advises them to talk about it calmly when things almost get violent. Wu Bi’s father tells him that he feels looked down upon because his son chose to live with Su Yu and his family when he has all the money, which enrages his son, who responds that he likes his new family and questions his father about why he cannot act as someone else’s child when his father snatches someone else’s wife. The couple only leaves when the latter is accidentally hurt by the former.
Later that evening, Wu Bi is embarrassed by his father’s behavior, but Su Yu tells him not to worry because their family is open-minded, which surprises the former. After all, he expects him to be serious about what happened. Su Yu informs him that Wu Bi has influenced him and that meeting him has caused him to reconsider his opinions about their social standing. Wu Bi says that money or material things are objective, while love is not. In passing, Su Yu comments that Wu Bi’s father might just not be good at expressing himself, but he saw the worry in his eyes when he looked at his son. Their conversation then shifts to their dreams, with Wu Bin sharing that he wants to be an astronaut and even promises to get a star for Su Yu, while the latter confesses that he wants to be a traveler and visit Tibet.
Meanwhile, Aunt Zhou proposes that she and Lao Si open a formal business to provide a better life for their children.
The girl who used to fancy Su Yu begins to see his closeness with Wu Bi at school, discreetly observing and shipping them together. Zhang waits outside for her son and stepson, who are preoccupied with Duo Duo and haven’t noticed her. She speaks with a close friend whom she has asked to research her ex-husband’s new wife. The friend advises that she use Duo Duo as a bridge to Su Yu, believing that the small girl will be seduced by new toys, and she agrees to give it a shot.
Meanwhile, Wu Bi strives to improve his study habits as evidenced by Su Yu’s effect on him following their conversation. Zhang pays a visit to Duo Duo, bringing gifts in the hopes of buying the little girl’s loyalty, but is rejected. She learns the girl is sharper than she thought and concludes Aunt Zhou is a bad mother. Duo later informs Su Yu about the visit. Zhang buys Su Yu a house as a gift in the hopes of persuading her son to live with her, but she is ignored. Su Yu tells his mother to quit interfering in their family concerns and issues an ultimatum that if she does, he will inform Wu Bi about the statue.
Wu Bi has been tasked with filling out the roster for the upcoming school sports tournament. Su Yu signs up for two events to lessen his stepbrother’s concerns, while the former signs up for Mao Chong without his permission. Wu Bi coaches Su Yu in preparation for the relay while a miserable Bo Kuang tries to keep up with their training.
When the school sports festival arrives, Wu Bi competes and wins the 100-meter run, breaking the school record. Su Yu and Bo Kuang compete in the 500-meter run, as the rest of the class cheers on the former. The audience witnesses three students banding together and attempting to intercept Su Yu, which Bo Kuang also notices. He helps Su Yu by running slowly in front of the three, allowing Su Yu to pass them. Meanwhile, Wu Bi returns to the field and runs alongside Su Yu, exactly as they did during training, and cheers him on. Su Yu eventually wins and breaks a record. Wu Big enthusiastically embraces him at the finish line. The teacher requests that Wu Bi and Su Yu perform in front of the audience as a celebration of winning first place. They decide to sing “Goodbye, Lonely Heart,” the same song that Su Yu sang on Wu Bi’s first day of school and that he remarked on as having an old taste. It reveals that Zhang frequently sang the same song to Su Yu when he was a child. On their journey home, Wu Bi mentions that his mother likes the song and asks Su Yu why he knows it as well; the latter claims that he heard it by chance. Remembering his agreement with his mother to avoid mentioning her to Wu Bi.
Lao Si and Aunt Zhou inform the family that they are starting a business and are looking for a place. Wu Bi asks Mo Yi’s guidance to help the couple’s business by providing a free rental place secretly in exchange for shares, so as not to embarrass the pair. Without Wu Bi’s knowledge, Mo Yi has someone researching who would be renting the place and discovers that it is once again tied to Su Yu. The stepbrothers practice their dancing routine for Duo Duo’s family day at school. Wu Bi volunteers to cook and create homemade noodles while Lao Si and Aunt Zhou are busy with the store’s opening. Su Yu and Duo Duo munch on snacks while waiting for Wu Bi to finish when they see him leave with a pot. They initially assumed Wu Bi would throw the food and then pursue him to tease him. Surprisingly, they find themselves in a nearby cemetery, where Wu Bi lays the pot of noodles in front of his mother’s grave and wishes her a happy birthday.
In a flashback, Zhang performs “Goodbye, Lonely Heart” during Wu Bi’s mother’s birthday party when she was still living. When a coworker asks where their son is, the pair tells her that they will celebrate with him separately over a bowl of noodles.
While the relationship between the stepbrothers and Su Yu’s family is now sailing smoothly, it appears that Zhang’s involvement with Wu Bi’s mother may not be as simple as we think and is a ticking time bomb. Mo Yi does not appear to be letting go of his cousin’s affairs lightly either. If they are done out of concern or for his advantage, we are yet to find out in the next episodes dropping on August 4 and 5.
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Someone From The Past Comes Back in ‘Stay With Me’ EPs 9-12