The notorious "Black Dragon Faction" from Harbin has gathered a large number of Chinese border Korean workers and illegal detainees. In 2004, they invaded Seoul, South Korea on a large scale, led by Zhang Chen (played by Yin Qixiang)）The emerging criminal organization led by Zhang Chensu is known for being cruel and unscrupulous, committing all kinds of crimes for money, quickly threatening the existing forces in various regions, and hoping to dominate South Korea. Seoul was plunged into gang panic for a while, and at this timeIron Fist is famous for its ability to deal with a whole district of criminals in a day. The monster criminal police officer, Ma Xidao (played by Ma Dongshi), launched a special operation to sweep Seoul, which was invaded by underground forces, and vowed to send the Black Dragon SectBlow out the net and give them the most satisfying blow