Chamsel
Hyuna who is a Young beautiful and intelligent doctor, goes back In time to the joseon dynasty after having spoken at a presentation, where she explained about how to help in a child birth situation.
Getting dragged all the way back through a magic portal, to help a dying queen giving birth...
Unfortunately for the man dragging her she was in the beginning of her 'monthly' at the time, and cursing women with Menstruation and magic portals don't do very well together, and he is now cursed to go forward in time everytime she has her period.
Her being one of those girls that get 15 days at the time, he is indeed destined to get a hard time!!!