Gloria is an intense Korean romantic drama that tells interweaving tales of characters that must overcome great odds to achieve success and happiness. The main protagonist, Na Jin Jin (Bae Doo Na) is a beautiful and feisty young nightclub entertainer who must endure work at several seedy clubs to provide financially for her family. Her income from these singing engagements is particularly crucial because of the expensive care required for her developmentally delayed sister, Jin Joo ( Oh Hyun Kyung), who is completely unable to care for herself. Her primary source of moral and emotional support comes from her close childhood friend Ha Dong Ah (Lee Chun Hee), a fighter who has become involved in organized crime in order to make more money. Na Jin Jin's life is complicated not only by Ha Dong's criminal pursuits, but also by several potential romantic entanglements that have the potential to end in disaster for everyone involved.