There were two novels with Kangxi as the male lead: I Am Geng Jingzhong in Time Travel and I Am Kangxi in Rebirth. The former told the story of Geng Jingzhong who traveled back to the early years of Kangxi in search of restoring the Han Dynasty, while the latter was the story of an ordinary person who traveled back to Kangxi and faced the struggle of the court and the problem of wives and concubines. I hope you like this fairy's recommendation. Muah ~😗