I Became Invincible After Contracting the Ancient Nine-Tailed Fox Campus Queen

[One heroine + romance + strategy + youth and school life + overpowered protagonist + live-in son-in-law + lighthearted comedy]

On his eighteenth birthday, Lin Ye, the worst student in the martial arts exam, awakened a bizarre talent: he had to form a contract with a demon beast within 24 hours or die on the spot! Just as he was losing hope, fate brought him into a bond with Su Qingqian, the school's S-rank prodigy and beauty! Even more astonishingly, the contract not only saved his life, it also made him the only “tranquilizer” for the volatile bloodline inside Su Qingqian. From then on, to keep him alive and keep herself in control, the aloof school beauty was forced to keep Lin Ye by her side, claim they were a couple, and guide him through leveling up step by step. With his “master of theory” mind, Lin Ye turned the tables and carried the school beauty to victory. Together, they became the strongest symbiotic pair, forced to steamroll their way through the city!