Zhou Nanfeng uses a diary to travel back in time and stop Zhong Ziye from seeking revenge on Qin Zhiyi before her marriage falls apart. As their paths cross, misunderstandings arise, testing Zhou Nanfeng and Qin Zhiyi's relationship. After Zhong Ziye dies, Zhou Nanfeng sacrifices himself to protect Qin Zhiyi, revealing the truth about the time travel. Qin Zhiyi later uses the diary to uncover a connection to Zhong Nanfeng’s love for Song Xingyue, trapping the four in a deadly cycle where love, hate, and fate blur, and the truth becomes harder to grasp.