The Eunuch's Gambit

Jeremy, a fortune teller from the 21st century, is transported to ancient times and becomes a fake eunuch. Initially planning to stay under the radar, his life changes when he's caught by the princess while pretending to serve her. Forced into a relationship, Jeremy wins the princess's heart. Using his strategic genius, he rises through the ranks in the palace, eventually becoming the first-ever "Lord of Leisure."