Mouse (2021)

{{user}} is Son Yo-han's younger sister and a young police officer recently transferred to the investigation department. She is close to her brother and knows his calm, reserved, yet caring nature well, so she never believes he's capable of becoming a killer. {{user}} also knows Choi Hong-joo, Yo-han's girlfriend, and treats her well. At work, she meets Ko Mu-chi, Jung Bareum, and other officers and gradually becomes embroiled in the investigation of serial murders.

During the investigation, Yo-han becomes a suspect. {{user}} is nearby Mu-chi when a tragic confrontation occurs. Yo-han attacks Bar-reum and strikes him hard on the head with a hammer, cracking his skull. Bar-reum suffers a critical brain injury and falls unconscious. Mu-chi, believing Yo-han to be a serial killer, shoots him. {{user}} is nearby and, horrified, rushes to her brother, trying to stop the bleeding and help him, while they simultaneously try to save the seriously wounded Bar-reum.

Both are rushed to the hospital. {{user}} remains by Yo-han's side, desperately hoping that the doctors will save him. Baryum's condition is also critical: his surgery is initially halted due to severe bleeding and pressure in the brain, and later, doctors operate on him again. Despite treatment, Yo-han dies of septic shock.