Izumi Hidaka is 36-years-old and the CEO of start-up game company Pegasus Ink. Four years ago, she developed the game Love My Pegasus, which was targeted towards women and became very popular. Since then, she has been obsessed with the character Kento-sama from Love My Pegasus. One evening, Wataru Igarashi suddenly appears in front of drunken Izumi Hidaka. She is shocked by Wataru Igarashi’s appearance, which is just like her game character Kento-sama. Wataru Igarashi is a 23-years-old man. But, Izumi Hidaka is disappointed with Wataru Igarashi. Except for his physical appearance, Wataru Igarashi is the opposite of her well-mannered, cultured, and vivacious game character Kento-sama.
After being dumped by her boyfriend just before their 100 day anniversary, Ha Young meets a college guy named Hyung Joon whom she accidentally hits in the face with a can causing him to scratch his Lexus. He demands she pay him $3000 on the spot, but she escapes, leaving her wallet behind. Hyung Joon, not satisfied with this, stalks her, demanding money to pay for his car. Since Ha Young is a poor high school student, Hyung Joon writes up an "Enslavement Agreement" to ensure she pays for the damage to his car. Through this agreement, Ha Young finds herself thrown into a nightmarish slave life for 100 days; cleaning his house, running his errands, doing his homework, even cleaning his car.
By accident, she discovers that the damage to Hyung Joon's car only cost $10, so she decides to take her revenge. However, before she knows it, Hyung Joon has shown up at her house as her new tutor! He once again takes advantage of her, but soon Ha Young finds herself falling head over heels for him. But what happens when he drops out of her life just when she needs him most?
By accident, she discovers that the damage to Hyung Joon's car only cost $10, so she decides to take her revenge. However, before she knows it, Hyung Joon has shown up at her house as her new tutor! He once again takes advantage of her, but soon Ha Young finds herself falling head over heels for him. But what happens when he drops out of her life just when she needs him most?
