Binnie is just your average smart kid in college who's at a point in her life where she actually gets stressed. She decides to take a walk but unfortunately, it wasn't a very smart move to just waltz out alone at 3am in the morning and poor Binnie finds herself in.. a huge burlap sack? After some accidental kidnap of sorts Binnie finds her life beginning to intertwine with a girl named Jiho, an outgoing,fun-loving cool kid who just so happens to be stealing something important

The I.O.U. is a company who works secretly, providing justice using methods which may or may not break the legal laws. 25 years after it was founded, The I.O.U. recruits eight different girls, insisting that they owe the company and to pay for their debts they must become the latest unit named: Oh My Girl. Hyojung is an innocent girl who has led most of her life digging up ginseng or something and becomes the leader of the group. JinE is a girl with a mo