Sorry, I'm Just a Useless Beta

[Female beta and male omega, but it's BG. Sorry, I have weird tastes.] Li Huan transmigrated into a book. She transmigrated into an ABO novel as a beta thug with the same name, a cannon-fodder character with terrible grades who was good for nothing. In the few scenes she had in the original story, she was either with the other thugs, bragging about how brilliant their cannon-fodder boss was, or acting as the boss's yes-man and henchman. The most important plot point she took part in was joining the thug boss in tormenting Su Huaiyou, the original novel's most evil omega villain. They pushed him over the edge, turning him into a complete lunatic and a danger to society. After transmigrating into the book, Li Huan had planned to turn over a new leaf, become a decent person, and say goodbye to the thug boss for good. But after sorting through the original body's memories, she discovered that the poor girl had no parents and no money. Her tuition and living expenses were all paid for by the thug boss's family. Li Huan: Uh... Li Huan, who wasn't particularly tough, ambitious, or selfless, and didn't want to work herself to death to support herself, decided to keep mooching off the boss. Soon, the day came when the evil villain Su Huaiyou was supposed to go completely dark. The thug boss deliberately injected him with a drug that would make his pheromones go haywire, planning to record his lewd reaction after the drug took effect, then use the footage to blackmail and amuse himself. But something went wrong with the drug. Not long after the injection, Su Huaiyou went into heat, crying as he smashed things violently. His rich, fruity pheromones were so overpowering that even Li Huan, a beta, couldn't stop sneezing. The thug boss was a little scared. In the critical moment, he suddenly shoved Li Huan forward. "You! Go mark him!" Li Huan: ??? What nonsense are you talking about? I'm a beta! Why don't you do it yourself?! The thug boss was an omega too, so she couldn't do it. For the sake of her own life, Li Huan gritted her teeth and braced herself. No matter how hard the process was, Li Huan ended up with a boyfriend without any pain or effort. Her boyfriend was handsome, rich, tall, long-legged, and had a great butt. When he wasn't acting crazy, he had a pretty nice temperament. There was just one thing Li Huan couldn't stand. Maybe it was instinct, but every time they got intimate, he would deliberately expose the back of his neck and ask her to bite him. Li Huan was close to tears. I'm just a beta! I can't mark you! What good will biting you do, apart from leaving your neck covered in teeth marks and saliva?! Theme: An ordinary, peaceful life is what matters.