Watch Second Sister (2025) Episode 1 with English subtitles

About Second Sister

The gripping cyberthriller Second Sister tells the heartbreaking story of Jieun, a high school student whose life is cut short after becoming the victim of a heinous crime. Instead of receiving support, Jieun is relentlessly targeted by malicious online comments and distorted posts that falsely frame her as the perpetrator, ultimately driving her to suicide. Devastated by the tragic loss, her sister Soeun refuses to let the lies stand. Determined to uncover the truth and clear her sister's name, Soeun teams up with detective Junkyung. Together, they launch a relentless hunt for a mysterious suspect hiding in the shadows of cyberspace. As Junkyung digs deeper, the investigation unravels a highly complex web of anonymous accounts and dark secrets. This intense mystery highlights the devastating impact of online misinformation and a sister's desperate fight for justice. Can Soeun and Junkyung expose the real culprits behind the screen before it is too late?