Lu Zailin is a high-achieving student at B City No. 1 Middle School who, despite his academic success, harbors a deep-seated resentment toward Qi Yu, a fellow top student and campus heartthrob. The rivalry between them is public knowledge, fueled by rumors and Lu Zailin's own aggressive behavior, though the root of his animosity remains unclear. After taking the Gaokao, Lu Zailin suffers a medical emergency caused by hormonal imbalance due to underdeveloped glands. Doctors reveal that he is an Omega who has not yet differentiated, a fact that disappoints him as he had always hoped to become an Alpha. He is confined to his home for a month to recover, during which time he experiences strange symptoms of heat and heightened sensitivity to pheromones.
A class reunion organized by his friend Jian Yang becomes the catalyst for a series of dramatic events. At the KTV, Lu Zailin is forced to play Truth or Dare, where he is dared to call Qi Yu and confess his feelings. Reluctantly, he dials the number and delivers the lines, only for Qi Yu to respond with indifference before hanging up. Shortly after, Lu Zailin leaves the venue and is harassed by drunk men attracted to his pheromones. In his panic, he runs into the street and is hit by a car. Qi Yu, who happens to be nearby, calls for an ambulance and stays by Lu Zailin's side until help arrives. At the hospital, it is discovered that Qi Yu and Lu Zailin have a 99% pheromone compatibility match, a fact that shocks both their families.
Lu Zailin suffers from temporary amnesia due to the concussion and wakes up with no memory of his past, including his rivalry with Qi Yu. He learns he has differentiated into an Omega and, despite his previous desires, accepts it with a gentler demeanor. He enters university, where he reunites with Jian Yang and meets new roommates. Unbeknownst to him, Qi Yu is also enrolled at the same university. Lu Zailin discovers a contact saved as "Boyfriend" in his phone but has no memory of who it belongs to. He assumes he is in a relationship but is confused by the lack of communication from this person.
As Lu Zailin navigates his new life, he repeatedly crosses paths with Qi Yu. Their interactions are tense and awkward, with Lu Zailin instinctively recoiling from Qi Yu's Alpha pheromones due to his sensitive state. However, Qi Yu displays a protective and concerned attitude that contradicts the cold persona he presents to the public. During a freshman party, Lu Zailin witnesses Qi Yu performing a piano piece titled "Confession Night," which carries an undertone of regret and unrequited love. This leads Lu Zailin to suspect that Qi Yu might have feelings for him, a suspicion reinforced when he realizes he can smell Qi Yu's pheromones despite Qi Yu's efforts to conceal them.
The story reaches a critical turning point when Lu Zailin experiences his first heat while alone in the university studio. He locks himself in a restroom stall, where Qi Yu finds him. Instead of taking advantage of the situation, Qi Yu helps administer an inhibitor and waits outside for Jian Yang to arrive. This act of restraint deepens Lu Zailin's confusion and curiosity about Qi Yu's true intentions. Later, during a class outing, Lu Zailin injures his foot in a stream, and Qi Yu rushes to help him, carrying him to the car and tending to his wound with evident care. Throughout these encounters, Lu Zailin begins to piece together the possibility that his "boyfriend" might be Qi Yu, and that their past rivalry may have masked a deeper, unacknowledged connection. The narrative follows Lu Zailin's journey of self-discovery as he navigates his new identity as an Omega, deals with the aftermath of his amnesia, and slowly uncovers the truth about his relationship with Qi Yu.
