Overview: Due to lack of mutual trust, KIU and MAN perform unsatisfactorily in the anti-riot exercise, leaving all the instructors a very bad impression. MAN comes across a group of illegal gamblers in the police station, one of whom is the father of the girl who drowned in the sea. He becomes suspicious about the death of the girl when he knows that the guy is deep in debt. MAN tells YAN what he thinks and they later discover that the drowning of the girl was not an accident but a case of murder. YAN’s grandmother YEE-MUI reveals to MAN that YAN has locked herself up in her bedroom for two solid days. MAN tries his best to cheer YAN up and finally manages to make her smile again. The PTU training has become more and more demanding and FUNG’s subordinate MA WING-KWONG, who is very familiar with guns, finds it really difficult to catch up. KWONG keeps making mistakes, causing him and the whole team to be punished……