Replying...
Intro. Do Do-hee, a cynical heiress and Jeong Gu-won, a 200-year-old demon who loses his powers upon meeting her. To avoid her extinction, he must protect her and they marry under contract, which leads them to a complex relationship where initial competition and mistrust give way to an unexpected romance as they face enemies and seek to get their lives back.

My adorable demon

@Xochitl Castruita