Lin Xuxing transmigrated into a book.
He wasn't the mighty, overpowered protagonist of a male-oriented power fantasy, nor the male lead in a romance-focused story for women, surrounded by romantic wish fulfillment. He was the protagonist bottom of some obscure, all-bottoms-get-used-as-sex-toys story.
The System gloated: "This is what you get for playing with men's feelings!"
Lin Xuxing looked confused. "What's an all-bottoms-get-used-as-sex-toys story?"
The System: "..."
Instead, Lin Xuxing's question left the System at a loss for words.
While Lin Xuxing was still trying to figure out why he'd been accused of "playing with men's feelings," he suddenly realized that several of this world's other protagonists were brothers he'd never appeared together with before.
Lin Xuxing understood.
Lin Xuxing felt guilty.
Lin Xuxing repented.
He shouldn't have solemnly told every one of them, "You're my one and only good brother!"
When Lin Xuxing arrived in the book, his desk mate had the face of Brother No. 1 and was stroking his thigh, just about to undo his waistband.
Lin Xuxing glanced at their test papers, grabbed his rich desk mate, and said with complete seriousness, "You only got eight points in math. How can you have the nerve to fool around in class?"
Rich desk mate: "?"
In the middle of the night, his roommate, an athlete with the face of Brother No. 2, lifted his covers and was about to climb into bed. Lin Xuxing grabbed his hand too. "Great, I can't sleep either. Let's study English together."
Athlete roommate: "?"
During a gym class nobody cared about, his poor classmate, with the face of Brother No. 3, cornered him and glared at him darkly.
Lin Xuxing reached into his bag, pulled out a big stack of textbooks, and put them in his hands. "Then I'll leave it to you to finish all my homework!"
Poor classmate: "?"
The System, which had witnessed the whole thing: "What are you doing?"
Lin Xuxing looked at them with pity. "A rich kid with money but no family affection, an athlete injured after messing up in a competition, a poor student with a miserable home life. What pitiful lives, like discarded rags."
And they were all using his brothers' faces, too. How tragic. He, Lin Xuxing, had to save his good brothers.
The System: "?"
The System: "Who told you that 'rags' meant those kinds of rags?"
Lin Xuxing looked baffled. "Then what kind of rags did you mean?"
The System: "..."
Finally, the System said, unable to explain: "You'll find out soon enough."
When Lin Xuxing finally understood what an all-bottoms-get-used-as-sex-toys story was, he broke down. "Don't do that kind of thing with my brothers' faces!"
Lian Mu spent over a decade by Lin Xuxing's side, taking on different identities. Lin Xuxing told each of those identities the same lie, but perhaps one of them was true.
Lian Mu thought, he had to find out which one was true.
Obsessive, deranged top x cheerful, straight bottom.
* 1v1 childhood friends, both pure, with a split-personality top.
* The top is genuinely insane.
Theme: May you be happy every day