While studying abroad, Jiang Shu received a final phone call from her best friend, Xiao Zhaodi, who excitedly told her about a great job opportunity—working as a tutor for a wealthy family. The pay was generous, the child was sweet, and the father seemed kind. But shortly after, Xiao Zhaodi vanished, leaving only a letter behind. Determined to find her, Jiang Shu assumed the alias "Wanjun" and became the new tutor in the mysterious mansion. However, she soon realized that everything was different from what her friend had described. As she investigated, the mysteries deepened, and all leads went cold. Just as her search stalled, she met the family doctor, Qin Dong, who visited weekly—and to her shock, he was her ex-boyfriend, whom she had abandoned to go abroad. He didn’t expose her but gave her vague hints, making her suspect he knew something. Yet when she probed further, he played dumb. Then, Pei Yuzhou brought in a new tutor, Lin Wan, intending to replace Jiang Shu. Unwilling to leave, Jiang Shu bribed Pei Weiyuan, the child, to throw a tantrum and demand she stay. Lin Wan immediately acted like the lady of the house, putting on a polite front in front of Pei Yuzhou but treating Jiang Shu with hostility. When Qin Dong returned with more cryptic hints, Jiang Shu lost her temper and confronted him, threatening suicide unless he told the truth. Finally, he revealed the shocking reality—she had walked right into a carefully laid trap, and she was the prey.