Dr. Kkang is a Korean drama that is also known by the names Dr. Gang and Dr. Kkaeng. The show is about a gang member named Kang Dal-Go (Yang Dong Geun), who disguises himself as a doctor and falls in love with an actual doctor named Kim Yoo-Na (Han Ga In). Kang Dal-Go is forced to leave a gang after he becomes the subject of a police investigation. He decides to leave Seoul and settle in a city called Busan. Besides the romance blossoming between the fake doctor and the actual doctor the show also focuses on Suk Hee-Jung (Lee Jong Hyuk), who is struggling to become a prosecutor after being raised as an illegitimate child and Yoo-Na's sister-in-law, Lee Hye-Young (Park Shi Eun), who is forced to raise her child alone after her husband is killed by gangsters. Another large part of the show is Hee-Jung being a part of a love triangle with Yoo-Na and Dal-Go.