When the Phone Rings - Episode Guide

After receiving a call from Hong Hui Ju's kidnapper, Baek Sa Eon attempts to learn more about him — only to find it's hard to escape his surveillance. 

Sa-eon works quickly to track down the caller, forcing Hee-joo to stay extra vigilant. Despite her fears, she continues to play along with the ruse.

After Sa Eon experiences an attack, he grows wary of Hui Ju's relationship with her friend. Meanwhile, an ominous figure makes his presence known.

After receiving the ominous call, Hee-joo abandons her clandestine plan. She then undergoes a tough interview with Sa-eon — sharing an intimate moment.

Sa Eon grapples with feelings of betrayal after learning the truth about Hui Ju. However, when she receives good news, they begin to grow fonder.

Hui Ju confronts a figure from her past who wishes to reveal what she knows. She then embarks on a retreat with Sa Eeon — who becomes possessive of her. 

Sa Eon and Hui Ju's relationship shifts after her harrowing rescue. Determined to catch the kidnapper, Sa Eon goes full force — with the help of 406.

As Hui Ju and Sa Eon grow closer, the threat from the kidnapper intensifies. Sa Eon discovers an ominous and shocking clue from a past figure. 

Hee-joo worries about Sa-eon after learning the truth about him. She later appears on the stage of her dreams, side by side with her love.

As Hui Ju and Sa Eon grow closer, the threat from the kidnapper intensifies. Sa Eon discovers an ominous and shocking clue from a past figure. 

After Hee-joo's bold move, her fate and that of her kidnapper remain uncertain. But Sa-eon refuses to give up — leaving no stone unturned to find her.

Sa-eon abandons everything he's worked for, leaving Hee-joo completely alone. But after a clue arrives, she embarks on a journey to reunite with him.