The story follows Hunter and Yat, two new hot shot recruits, who under the watchful eye of their commanding officer, Yuk Pai, rise quickly through the ranks, enduring much mental and physical hardship along the way. Their new found skills are put to the test when renegade SDU member returns from seclusion in Thailand to wreak havoc on Hong Kong and the SDU's most secret missions.

In 1949, CCP domain the mainland China and many people moved to Hong Kong during this period, especially the soldier of KMT. Hong King Shan, general to embarrass leading his guides escaped to Hong Kong to lived at Tiu Kan Lan, but they were repelled by the other residents. After that, he know Fan, the head of Tsing Pong and a female doctor Sheung Tse Tin. Hon and Sheung fell in love but objected by Sheung’s brother. Fan convinced Hon and his followers to kill the head of black society, Simon, and re-build up the reputation the Tsing Pong ……