After being dumped by her boyfriend just before their 100 day anniversary, Ha-Young, meets a college guy named Hyung-Joon when she accidentally kicks a can that hits him in the face and causes him to scratch his Lexus. He demands she pay him $3000 on the spot. She escapes from him, leaving her wallet behind.

Hyung-Joon stalks her, demanding money to pay for his car. Since she is a poor high school student Hyung-Joon writes up a "Enslavement Agreement" for Ha-Young in order to pay for the damage to his car. Ha-Young is thrown into a nightmarish slave life for 100 days, cleaning his house, running his errands, doing his homework and cleaning his car.

By accident she finds out that the damage to Hyung-Joon's car only costs $10! She then takes her revenge. However, before she knows it Hyung-Joon shows 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 Hyung-Joon.

But what happens when he drops out of her life just when she needs him most?

Cast
Kim Jaewon - Ahn Hyung-jun
Ha Ji-won - Kang Ha-yeong
Kim Tae-hyeon - Yeong-eun
Han Min - Hyeon-ju
Kim Chang-wan - Ha-yeong's Father
Hong Ji-Yeong
Kim Ji-yu
Kim Min-kyeong
Lee Eung-kyung - Ha-yeong's Mother

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