17-Year-old high school student Li Maiyang. His childhood sweetheart Zilan suddenly told him that the person she liked was his best friend Zhang Xiaokai. After transferring to another school, Li Maiyang suffered from depression. He had to return to his original school. One day he went to the Forbidden City with Xiaokai and inexplicably time-traveled to become Kangxi's thirteenth elder brother... The fourth brother Yinzhen and the fourteenth brother Yinzhen Wanqing, who looks exactly like Zilan. I fell in love with Yulan unconsciously... Is it a destined encounter or an accidental encounter in fate?