This is an ABO world. Qi Yubai is an omega and the school bully, and suppressants have never worked on him. But one day, he happens to discover that he feels much better after the alpha Ji Yunheng has been in contact with him. A trip to the hospital reveals that they have a 97.5% compatibility rate. Only Ji Yunheng can help him. In other words, Ji Yunheng is the best suppressant for him.
In their previous life, Ji Yunheng confessed to him after their graduation dinner. Unable to understand his own feelings, Qi Yubai ran away. Ji Yunheng chased after him and was hit by a car. Unable to bear the shock, Qi Yubai passed out and transmigrated back two years, setting out to change his fate. (In his previous life, he never knew Ji Yunheng could help him. Whenever he went into heat, he was isolated and endured it in silence.)
But it turns out that all of this was Qi Yubai's dream. He was the one who got hit, and he became a vegetable. He woke up on the day of his coming-of-age ceremony in the dream. In his mind, Ji Yunheng had died. Remembering what the shaman had said, he cut out his own gland and became a person without independent consciousness. In the end, after being deeply shaken, he slowly regained consciousness.
Happy ending
There's also a girls' love couple in the story. If that's not your thing, feel free to skip it.
Older love interest
Note: One of the characters is my avatar, hehehe (˙︶˙?)
Theme: After breaking free of the dream and facing reality, will you fall into the abyss or step into a sea of flowers?