The story revolves around the Wui Yau Safeguard Agency, which is the most prominent safeguard and escort agency in Hangzhou. However, the agency was discovered to be close to bankruptcy, due to financial mismanagement. Together with his four sons, the patriarch of the family, Sheung Ching-Tong (Samuel Kwok) must, along with other allies and confidantes, rebuild the agency and save it from near certain death..