The president of a famous motorcycle company is killed together with his wife, and the alleged killer seems to be his brother, Sophy's uncle. Being forced to give up on her rights, Sophy, the only heir, runs away from home, trying to search for justice. Being followed by her uncle's subordinates, the young girl's path intertwines with Bo's, who she asks for help when she sees his martial arts skills. Being in a bad financial situation and more than that, suffering from memory loss, Bo refuses any involvement. But when the head subordinate kills the cook who replaced Bo's parents, he decides to take revenge, this way helping Sophy. Together with Bo's two best friends, they form a team in a short time, while Agent A and Agent B investigate the same case. But when Bo finds out that the head subordinate seems to have information about the past he can not remember, they all realise it wasn't about only one crime, and that the lives of all those involved are now in danger.