Tinted with You (2021)

In Korea’s feudal past, deposed Crown Prince Lee Heon is exiled after his cruel brother usurps the throne. With his life in constant danger, his only ally is his loyal guard, Geum. In the modern-day, high school student Eun Ho, an artist, accepts a commission to complete a mysterious unfinished painting. Drawn into the past, he meets Lee Heon and forms a romantic bond with him. As the acting king plots to kill Lee Heon, Eun Ho realizes he may be the prince’s only chance of survival. (Source: MyDramaList)