When Detective Yoon Yeoul tries to catch a groper on a crowded train, he instead nabs Jeon Taeheon, a prosecutor at the Seoul District Prosecutor's Office. After a rocky first meeting, they hope to never see each other again, but are then unexpectedly made the faces of a PR collaboration between the police and prosecutors. As they navigate their new roles, all kinds of tension flare between them. With sparks flying and their pride at stake, can Yeoul and Taeheon put aside their differences and unravel the mystery behind their puzzling new assignment?