Ex-Warden Tang is sent to prison because of corruption whereas Jun is sent back for a jail sentence because of the failure of breakout. Jun tempts Tang to help another breakout as Tang is so familiar with the structure of the prison, both get a commitment immediately. They even plant Big Roller in order to have a successfully breakout out. However, Jun finds out Tang plays a trick on him so that Jun is forced to turns his coat to Big Roller, Mak and even the new Warden Ma to disclose Tang's conspiracy for their safe.
