Second Sister

A high school student named Ji-eun dies by suicide after online rumors and hateful comments flip her role from a crime victim to a perpetrator in the eyes of the public. Seeking justice for her sister, So-eun recruits a detective named Jun-kyung to investigate the tragedy. Their search for the truth leads them into cyberspace, where they track a suspect and uncover a complicated network of anonymous accounts that transformed a simple rumor into a devastating lie.

The crime thriller was directed and written by Shin Jai-ho. In the director's career, this film follows 100 Days with Mr. Arrogant and precedes Wanted. Produced by Ji Sang-chul, the movie was a collaboration between several Korean production companies, including Studio Joyful, Big Ocean ENM, Studio Avali, and New Branch Contentory. The film has a runtime of 90 minutes and was released on December 17, 2025.