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Joo Yeol Mae (Jung Yoo Mi) gets entangled in a love triangle between her long term boyfriend, Yoon Suk Hyun, (Lee Jin Wook) and a new love interest, Shin Ji Hoon (Kim Ji Suk).

In a prologue, the cast is introduced to the settings and suspects of a murder case for the new episode. The cast then chooses their role in the episode, as a particular suspect or the detective. Other than the detective, each person is given detailed information about the suspect they are portraying including their personalities, alibi, relationship to the victim and other suspects, history, criminal motive, etc. Every suspect can conceal information until explicitly questioned by other suspects or the detective, but only the criminal can lie.