Detective Choi is on the trail of a notorious serial killer after a series of gruesome murders. As he delves deeper into the investigation, he discovers shocking secrets and a game of cat and mouse ensues.

In the heart of Hong Kong, a detective races against time to stop a hostile takeover in a siege situation. With a one-day timespan, he faces challenges like terrorism, police brutality, theft, and a race against a ticking time bomb. Along the way, he sacrifices his own safety and engages in hand-to-hand combat to save hostages and bring justice.