Peng Shenghua (played by Lam Hoi-fung) and Yu Fengzhi (played by Miriam Yeung) have been married for more than ten years. They have long been an old couple, and their lives have lost romance and passion. One day, Yu Fengzhi accidentally discovered the blog of her high school classmate Su Bowen (played by Wu Zhaoxuan). An old song made her recall her past school days. In school, Peng Shenghua, Yu Fengzhi and Su Bowen are inseparable friends. Peng Shenghua is lively and active by nature, and is the pistachio in the class, while Su Bowen is much more introverted. He is silent and honest. He likes to tinker with mechanical inventions and hopes to become a pilot. In the end, Yu Fengzhi chose Peng Shenghua, and now has a calm life. Recently, she found that her husband's whereabouts were strange and seemed to have signs of cheating. The beautiful memories and the pale reality made Yu Fengzhi decide to look for Su Bowen's traces. In the end, she discovered a secret that had been hidden for many years.