When The Phone Rings

After receiving a call from Hong Hee-joo's kidnapper, Paik Sa-eon attempts to learn more about him; Paik Sa-eon finds it hard to escape his surveillance.

After Sa-eon experiences an attack, he grows wary of Hee-joo's relationship with her friend; an ominous figure makes his presence known.

Sa-eon grapples with feelings of betrayal after learning the truth about Hee-joo; when she receives good news, they begin to grow fonder.

Hee-joo confronts a figure from her past who wishes to reveal what she knows; she embarks on a retreat with Sa-eon, who becomes possessive of her.