Patrol officer Tae-jin's soul separates from his body after an accident. To reunite with his girlfriend, he must solve a case as a spirit, aided by his unlikely ally Jang-su, a judo instructor who can see him.

Tae-jin, a patrol officer, gets into an accident while investigating a case, and his soul gets separated from his body. He is desperate to solve the case and return to his beloved girlfriend, but is at his wits' end as a wandering spirit. Unexpectedly Tae-jin discovers someone who can see him, but it is none other than his archfoe and neighbor Jang-su, who runs a judo studio.