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Shi-Hyun (Jung Kyung-Ho) grew up in an orphanage, before running away from there. He then made a living by working as a drug courier and picked up the nickname "Doctor." He's now the boss of a mid-size gang. His drug supplier is a man known as Scale (Kim Byung-Ok). Shi-Hyun has plans take over his position.
Meanwhile, Hyeong-Min (Lee Jae-Yoon) becomes the section chief of a special investigation unit. Their goal is to take down Scale, who killed an undercover officer. Hyeong-Min's girlfriend Kyung-Mi (Ko Na-Eun) is also a detective. She also grew up in an orphanage with Soo-Min (Nam Gyu-Ri). They grew up like real sisters and Soo-Min is now studying to enter the police academy.
While trying to catch Scale, Hyeong-Min learns about a guy called "Doctor." Now, Hyeong-Min and his team go after Shi-Hyun.
Although they’re not real sisters Soo Min considered Kyung Mi as her sister. Soo Min becomes police because she admires Kyung Mi.While they investigated drug-cartel, Kyung Mi was killed by someone.
Lee Jae Yoon as Ji Hyung Min
Police chief who is the head of drug-organization investigation team.
He lost his fiance, Kyung Mi, just before thier wedding ceremony.
He can not forgive the killer and put Soo Min to do undercover job. Very smart man!