Undercover

Jeong-hyeon and Yeon-su are faced with an uncomfortable feeling as they both work hard to live an ordinary life of raising their autistic son.

Jeong-hyeon must lie to protect Yeon-su while she becomes involved in a potentially dangerous case.

Seung-gu is targeted as Hyeong-rak conspires against Yeon-su to prevent her appointment, while a letter arrives from the late Cha Min-ho.

Seung-gu's assault speculations risks Yeon-su's appointment, and Jeong-hyeon looks into "Project Deep-Pockets"

Jeong-hyeon uses Yeong-geol to uncover the truth behind "Project Deep-Pockets," while a whistleblower causes chaos at Yeon-su's appointment hearing.

Yeon-su risks her appointment to take responsibility for the situation, and Jeong-hyeon rushes to help her when he finds out she is in trouble.