Li Xing, a history college student, participated in the space-time experiment out of curiosity about the truth about the Kangxi Dynasty's seizure of the throne in Kowloon. However, his brain waves drifted to a parallel Qing Dynasty that was 96% similar to his own world, and possessed Hongshi, the young concubine of Yongzheng.
He was originally a rational and calm student who just wanted to quietly watch the development of history, but he ended up being involved in it involuntarily.