Brothers Bo and Wei are forced to join the triad in Hong Kong after arriving from China. They become successful drug dealers but sacrifice their family happiness for money and power. Once the ICAC is established, they become its targets and struggle to escape its grip.

Cheng Qingfeng lost his parents at a young age and lived with his older brother, Cheng Lang. He was shocked to witness his brother sacrificing his own wife and child to escape from enemies. Thankfully, Qingfeng managed to save his nephew, Jia Bao. From then on, Qingfeng lost contact with his brother. He settled in a rural area and entrusted Jia Bao's upbringing to a kind-hearted man named Bing.

Eighteen years later, Qingfeng learned exceptional martial arts skills and disguised himself as a simple-minded doctor. In reality, he was the legendary vigilante known as the Dragon Shadow Hero, who upheld justice and punished evil. His fellow disciple, Zongxin, always accompanied and supported him. In order to reunite with Bing and Jia Bao, Qingfeng traveled to a place called 'Treasury City.' On his way, he learned about a local tyrant named You Wanjin, who oppressed the people with his power. This fueled Qingfeng's determination to visit Treasury City even more...