Three years ago, Zhai Ling and Zhai Manyun were tricked by their best friend and sold to an industrial park in the Northern Triangle. Zhai Ling's parents, who had paid to ransom them, were brutally killed by wild wolves, and Zhai Ling and her brother were then sold off to another industrial park as merchandise. Three years later, Zhai Ling returns as Phoenix, the top female assassin in the Northern Triangle, vowing revenge. None of the enemies from that time will escape.