When the Phone Rings

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. (Source: Netflix)

Sa Eon works quickly to track down the caller, forcing Hui Ju to stay hypervigilant. Despite her fears, she continues to play along with the ruse. (Source: Netflix)

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. (Source: Netflix)

After receiving the ominous call, Hui Ju abandons her clandestine plan. She then undergoes a tough interview with Sa Eon — sharing an intimate moment. (Source: Netflix)

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. (Source: Netflix)

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. (Source: Netflix)

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. (Source: Netflix)

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. (Source: Netflix)

Hui Ju 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. (Source: Netflix)

While attempting to rescue Hui Ju, Sa Eon discovers another surprising conspirator — whom he later tries to persuade to help locate the kidnapper. (Source: Netflix)

After Hui Ju's bold move, her fate and that of the kidnapper remain uncertain. But Sa Eon refuses to give up - leaving no stone unturned to find her. (Source: Netflix)

Sa Eon abandons everything he's worked for, leaving Hui Ju completely alone. But after a clue arrives, she embarks on a journey to reunite with him. (Source: Netflix)