When the Phone Rings

• 
  E1

  Episode 1

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

  2024-11-22 · 66m
• 
  E2

  Episode 2

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

  2024-11-23 · 69m
• 
  E3

  Episode 3

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

  2024-11-29 · 68m
• 
  E4

  Episode 4

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

  2024-11-30 · 70m
• 
  E5

  Episode 5

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

  2024-12-13 · 71m
• 
  E6

  Episode 6

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

  2024-12-14 · 70m
• 
  E7

  Episode 7

  Sa-eon and Hee-joo's relationship shifts after her harrowing rescue. Determined to catch the kidnapper, Sa-eon goes full force — with the help of 406.

  2024-12-20 · 69m
• 
  E8

  Episode 8

  As Hee-joo and Sa-eon grow closer, the threat from the kidnapper intensifies. Sa-eon discovers an ominous and shocking clue from a past figure.

  2024-12-21 · 71m
• 
  E9

  Episode 9

  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.

  2024-12-27 · 66m
• 
  E10

  Episode 10

  While attempting to rescue Hee-joo, Sa-eon discovers another surprising conspirator — whom he later tries to persuade to help locate the kidnapper.

  2024-12-28 · 68m
• 
  E11

  Episode 11

  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.

  2025-01-03 · 64m
• 
  E12

  Episode 12

  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.

  2025-01-04 · 67m

Top cast

Yoo Yeon-seok

Baek Sa-eon

Chae Soo-bin

Hong Hee-ju

Heo Nam-jun

Ji Sang-woo

Jang Gyu-ri

Na Yu-ri

Lee Doo-seok

Kang Hyeong-Cheol