In a dramatic turn of events, Park Min-young's character, who was under suspicion of murder, manages to secure a crucial alibi, escaping arrest. However, new suspicions raised by Wi Ha-joon's character and a shocking revelation leave her character in turmoil.
The fourth episode of tvN's 'Siren', aired on the night of the 10th at 8:50 PM, showcased Cha Woo-seok (played by Wi Ha-joon) infiltrating the exhibition hall ahead of Do Eun-hyuk (played by Han Jun-woo) to obtain a memory card, the key evidence in the case.
In this episode, Cha Woo-seok deciphers a subtle lip movement shown by Han Seol-ah (played by Park Min-young) during interrogation, with the help of a call center sign language consultant. This leads him to the exhibition hall monitor, where he discovers the evidence. Despite the risk of becoming an accomplice, Cha Woo-seok mocks Do Eun-hyuk's boldness in helping Han Seol-ah. Do Eun-hyuk, however, stands firm in his belief in Han Seol-ah, stating he only wants to uncover the truth.
The video on the retrieved memory card clearly shows Han Seol-ah working on an installation art project at the time of Kim Yoon-ji's (played by Lee Elia) death, thus proving her alibi and securing her release. As Han Seol-ah exits the investigation, Cha Woo-seok confronts her with a sharp question about whether Kim Yoon-ji seemed like someone who would take her own life. Han Seol-ah leaves him with a cryptic response, "It's not about who is destined to do so, but rather anyone can face such a moment."
Later, Cha Woo-seok approaches Han Seol-ah again, revealing the true background of Kim Yoon-ji's persistent stalking, heightening the tension. He discloses that Kim Yoon-ji's obsession was not with Yoon Seung-jae (played by Ha Seok-jin) but with psychiatrist Choi Young-ho (played by Yoon Jong-hoon), who was her lover before meeting Han Seol-ah. Kim Yoon-ji believed Han Seol-ah had stolen her bright future, harboring resentment.
Faced with the revelation that resentment was the motive for suicide, Han Seol-ah is left feeling empty. However, Cha Woo-seok continues to probe, leaving open the possibility of murder, questioning the reasons behind the deaths of three men and what Han Seol-ah gained from it. Han Seol-ah retorts, questioning what she truly gained, stating she only lost precious things. Overwhelmed by emotions, Han Seol-ah collapses due to the side effects of excessive sedative use as she leaves the exhibition hall.
Reporter: Im Chae-ryeong, TenAsia syjj426@tenasia.co.kr