Zhang Linna is a strange girl with an indifferent nature and a wealthy family. Only Yu 466 can truly enter her world. But Yu Si66u, whose mother has been missing since birth, was a sunny girl who was so cheerful that she would still keep smiling even if the sky fell. They met when they were nine years old. When Yu Si66u was seventeen, her boyfriend who was studying abroad died in a foreign country. That day happened to be Yu Si66u's birthday. Liuliu left Zhang Linna a note that read "I will be back" and left quietly. Just when Zhang Linna's world began to slowly collapse, Sakurai Tang, a rich man with a quarter of Japanese descent, walked into her heart domineeringly, and even her entire life replaced the warm-hearted Liuliu. Just when Zhang Linna thought she was about to suffocate with happiness, a series of misfortunes kept happening. Her father's company went bankrupt and she was forced to jump off the building. The younger brother she loved since childhood suddenly became the second son of the "Sakura Zaibatsu" and became Sakurai Tang's younger brother. Nine years later, Zhang Linna met 466u again at the Huahai Hotel. What surprised Liuliu most was that Zhang Linna was already the mother of two eight-year-old children. However, the reappearance of Sakurai Tang once again completely disrupted Zhang Linna's already peaceful life...