After Transmigrating into a Book, I Was Marked by the Crazy Beautiful Villain [GL]

Su Mi transmigrates into a school ABO novel, becoming a vain and opportunistic sidekick to the villain, ultimately facing a tragic end. The beautiful and melancholic villain, an SS-level Alpha and the young yet unmatched head of the Shen family, is infatuated with the delicate heroine due to a certain “heart disease.” As the romance between the male and female leads progresses, the villain is supposed to exit the story gracefully— However, for some reason, the villain’s mental state collapses on the spot, dragging the leads and the entire small world into destruction. System: The host’s task is to reduce the villain’s darkening value. If the task fails, you will perish along with the small world. Su Mi: I don’t quite understand, but I understand. System: …What does the host understand? Su Mi: I will help the villain win over the heroine [fist pump]. From then on, the villain writes love letters with her help, dates with balloons she blows up, and during the villain’s susceptible period… All night long, the cold and damp Alpha pheromones seep into her nape, forming an ambiguous cage. Covering her nape, Su Mi holds her waist, packs up, and runs away, insisting: Last night was the heroine! I am a Beta! When the temporary mark fades, she nervously returns to continue the mission. But why does the villain’s gaze become increasingly strange! One day, Su Mi hides the drugged heroine in a staircase, urging the villain to come and rescue the beauty, hoping for a romantic culmination. The villain arrives but first pulls the heroine off Su Mi. Unbeknownst to herself, Su Mi has also inhaled the powder, her face reddening and legs weakening. The villain hugs her while she dutifully says, “Sister, Miss Xu is over there.” The villain smells so nice, Su Mi hesitates to push away. In a daze, it seems the villain sends the heroine to the hospital. While she is taken into the car. The enclosed space is filled with the rich scent of Alpha pheromones. Su Mi retreats step by step: “Sis-sister QAQ?” The villain pulls her close, cold fingers touching her nape, smiling, “Hmm? Little sister.” Author Notes: 1. Melancholic, manipulative villain A (Shen Han) × Clueless, silly follower O (Su Mi). No blood relation, just adopted sister. 2. ABO setting, alternate world, lots of private settings, no in-depth research. 3. In the original book, the villain’s feelings for the heroine are not romantic, and the romance-focused brain is Su Mi’s deduction. Tags: System, Sweet Romance, Modern AU, Transmigration, Light-hearted