Bai Yutan and Bai Shuiqian lost their father and mother when they were young. They had never left each other since childhood. On that day, Bai Yutan opened his parents' diary and found out that the girl he grew up with was not his sister, and Bai Yutan She chose not to tell Bai Shuiqian, and that day Bai Shuiqian accidentally found the diary that Bai Yutan had seen. Her emotions that had no place to place suddenly burst out, and eventually the two got married and gradually fell in love.