Peng Shenghua (Lim Hai-Feng) and Yu Fengzhi (Yang Qianwei) have been married for more than ten years. They are already an old husband and wife, and their life has lost their romance and passion. One day, Yu Fengzhi inadvertently found a high school classmate Su Bowen (Wu Zhaoxuan) blog, an old song let her begin to recall the campus years. At school, Peng Shenghua, Yu Fengzhi and Su Bowen are inseparable friends. Peng Shenghua is lively and active, and is the pistachio of the class, while Su Bowen is much more introverted. Silent and honest, he likes to fiddle with mechanical inventions. I hope to become an airplane pilot. In the end, Yu Fengzhi chose Peng Shenghua, so she has a quiet life. Recently, she found that her husband's whereabouts were strange and seemed to show signs of cheating. With good memories and pale reality, Yu Fengzhi decided to look for traces of Su Bowen. Finally, she discovered a secret that had been hidden for many years.