Cheot Kiss-neun Gyehoekjeogeuro

Many would choose the sweet fantasy of a novel over reality, but not Joo-in, who wakes up as Lydia in "Reaching for the Stars." Knowing the concubine was executed by the emperor for upsetting the heroine, the new "Lydia" holes up in her palace to avoid the couple. But after she meets Mar, a mysterious man who claims to be the emperor's runaway servant, Lydia is suddenly invited to the ball, threatened by a jealous concubine, and even bumps into the heroine! Though she has no idea what caused this domino effect, the catalyst is closer to her than she thinks...

(Source: Tappytoon)