Eternal Embrace: My Boyfriend Is a General EP 1

Chloe Sue, a modern-day archeologist, saves a random man on the sidewalk one day. This man turns out to be the Cavalry General of the Greater York Dynasty, Ethan Shaw. They travel back in time to Greater York and develop feelings for each other after a series of hijinks. Together, they fight against the Royal Duke, Walter Cabot, who is eyeing the position of crown prince for himself.