A story about a lion in the process of being tamed. 

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Hana, a private investigator who dropped out of high school to work with her uncle, the head police officer. Instead of attending school; she spent her years detaining people in the midst of adultery and other criminals lurking around the streets. All of a sudden, she was given a very life changing mission by an FBI official: to go undercover in the one place she knows nothing about - a university - and protect the life of a tycoon's daughter in case of any assassination attempts.

In able to fit in, she must act like a normal girl seeking for a certificate on a certain course. That may sound easy, but for Hana it was like stepping in the seventh circle of hell. The job requires her to become something she's not: a very affluent, charismatic girl who comes from a prestigious family.

During her first day in university, she meets quite a self-confident yet strong guy who she may have possibly a crush on, unfortunately he's the one sent by another businessman to assassinate the future heiress of South Korea's most successful business group.

Throughout her mission, her list of suspects grow as well as her problems, also she leans the importance of dream.