An angel accidentally finds himself in the demon realm, a place where no angel dares to tread. The angel is the rebellious son of a renowned blacksmith, known for causing trouble despite his family's wealth and status. In this unfamiliar and dangerous land, he crosses paths with a mysterious demon-secretly the son of the Demon Lord, though only a few know this. Publicly, the demon is known as the captain of the demon soldiers, feared and respected for his strength. Intrigued by the angel's presence, the demon decides to help him, unaware that this decision would lead him down a path of unexpected love.