Ga-kyung's language skills shock Yoo Philip and Yoo So-ran. Meanwhile, Kim Tae-ung's insistence that Ga-kyung return his wallet raises her suspicions.

Despite Ga-kyung's initial reservations about So-ran, the two join hands. On her first day at work undercover, Ga-kyung meets a familiar face.

Tae-ung remains suspicious of Ga-kyung, but also strangely captivated — or even charmed? Meanwhile, the Gugukdan start making big plans.

Asked to translate for an interrogation, Ga-kyung struggles when she recognizes the man being questioned. Tae-ung's feelings grow increasingly conflicted.

Sato Shinichi confronts his past. As the interrogation escalates, so do Ga-kyung's fears — leading her to find unexpected solace in Tae-ung.