Premise

at the beginning seems like the ordinary drama no sign of a good thing but when you reach half of this episode, you're gonna meet your interest
this is gonna be slow storyline

The key to turn back is still missing

Lee Min Jin struggling in her shoes of getting a job finds herself as a middle-aged woman in the morning. Unaware of the reason behind this sudden occurrence, she gets caught between day and night where she becomes ajummha in the morning and lives as a 20-year-old only during night. A mysterious disappearance of 20 people goes around as Min Jin looks around for a cat.