A man falls from a mountain peak to his death. The detective in charge, Hae-joon (PARK Hae-il), comes to meet the dead man's wife Seo-rae (TANG Wei). 'I worry when he does not come back from a mountain, thinking he might die at last.' Seo-rae does not show any signs of agitation at her husband's death. With her behavior so unlike that of a grieving relative, the police consider her a suspect. Hae-joon interrogates Seo-rae, and while observing her on stakeout, feels himself slowly developing an interest in her. Meanwhile the difficult-to-read Seo-rae, despite being suspected of a crime, acts boldly toward Hae-joon. A suspect who is hiding her true feelings. A detective who suspects and desires his suspect. Their Decision to Leave.