Kane (Michelle Chen) is a student with excellent character and academic performance. Recently, he found that his mother (played by Chen Xiaoxuan) was acting strangely. Ah Zhe (played by Yang Youning) is a homeboy who is addicted to online games. He is not good at speaking on weekdays, but he found that his father (played by Tang Zhiwei) seemed to have something to hide from others recently. On this day, Kane's mother had to go on a business trip for ten days. Coincidentally, Ah Zhe's father also had to go out for ten days. Kane and Ah Zhe were surprised, because their lives were calm and harmonious in the past. No one wanted their parents to cheat, but today's coincidence still aroused the suspicion of the two children. They decided to track and pursue, and made a "super destructive plan" to save their respective families. Kane and Ah Zhe found the physical evidence they had hidden, including letters, tapes, and diaries. Sure enough, they found clues. It turned out that 20 years ago today, they had made an appointment to date somewhere, and this was the time for the date 20 years later. The two who expected their parents to elope ignored the university exams that were about to begin and embarked on a journey of "catching adultery"...