Hee-sik witnesses the jarring effects of the drug when it strikes his team leader. Nam-soon's search for evidence garners attention from foes.

Geum-ju pays a strategic visit to Si-o, who has his own motives. During a birthday dinner, Nam-soon's family questions her growing kinship with Hee-sik.

Hee-sik begins to worry about Nam-soon after Si-o promotes her into his inner circle. Geum-ju probes deeper into a suspicious businessman.