Jang-soo is a judo instructor who is indifferent to everyone but his daughter. One day he realizes he can see Tae-jin, a ghost who used to be a devoted police officer. Tae-jin asks Jang-soo to help solve the case that took his life away from him.
The lives of Misong, an indebted prostitute living in a red-light district, and Geunhee, her parasitic pimp, may be the most vile and futile on earth. The harder they try to escape, the deeper they fall into the pit. Every day, survival becomes a war. Every day, Misong grows more and more exhausted, deprived of any hope. She also grows to resent Geunhee, a jobless burden. Geunhee is and always has been a patronizing deadbeat. One day, when Geunhee gathers the spirit to find a work, he encounters a familiar street thug who offers him dangerous opportunity that he cannot refuse. Geunhee now stands at a fork in the road where he must decide. A tragic love story between a girl and a man living in the gutter... It’s an outsider's (Ddaraji) life that cares for no one and no one cares about...
Lee Yong-gu es un hombre con problemas mentales: tiene un coeficiente de inteligencia de un niño de 6 años de edad, que es casualmente la edad que tiene su hija, la inteligente Ye-sung. Ambos llevan una vida feliz, pues Yong-gu se gana la vida trabajando como encargado del aparcamiento en un supermercado local. Pero un día, cuando la hija del comisario de policía muere en un extraño accidente, Yong-gu, que es el que encuentra su cadaver, es falsamente acusado y condenado a muerte por el secuestro, asalto sexual y asesinato de una menor de edad. Ye-sung es enviada entonces a una institución de menores, y Yong-gu es encarcelado y asignado a la celda nº7, en una prisión de máxima seguridad.
