Shi-Hyun (Jung Kyoung-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's Son." 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's Son." Now, Hyeong-Min and his team go after Shi-Hyun.
Once again these are MY opinions. Dont bash me too much xP
First of all if you like action thriller dramas, this is definitely for you. I honestly do not like action or crime dramas but since i heard so many great reviews on it, i decided to give it a try. I must say I was glued to the drama for days. I pretty much sat there for straight 20 hours and finished it (of course not literally but it felt like it). It was THAT good. Oh it was a bit dark.