“A prince who needs a lot of looking after, huh?”

Do Ha-jae, now a reaper, is living out his penance for the lives he took after becoming an evil spirit.

One day, the King of the Underworld gives him a mission:
watch over Hyun Joo-min, stay by his side until he peacefully lives out the rest of his days,
and then safely guide his soul to the afterlife.

The time limit: 99 days.
The reward: Ha-jae’s lost memories and a chance at reincarnation.