Arin is the maknae of a rich family headed by Hyojung the dad, or maybe it's headed more by JinE the mom? Well, moving on, she has two older sisters. Mimi the chill eldest and Jiho, the overprotective sis. Jiho has a cool girlfriend named Binnie who is an up and coming actress. Arin also has a private tutor named YooA whom Mimi always spies on secretly. Seunghee comes into the picture by getting hired to be Arin's bodyguard.

Seunghee and Arin start off on the wrong foot but after winter there'll always be spring. All Seunghee has to do for now is to protect the maknae~!