Chairman Lin (played by Ti Lung), the eldest brother of Hong Kong's largest underworld organization "Hua Bai Lian", sent his daughter A Ling (played by Shu Qi) to South Korea to hide because of the complicated struggles in the community. He asked the Korean underworld boss Yang, who was on good terms with him, to take care of his daughter. In order to protect A Ling, President Yang did not disclose her identity to his subordinates, but only asked his subordinate Ji Zhe (played by Lee Beom-soo) to protect A Ling well. But Ji Zhe didn't like this overly simple task. As soon as he came into contact with A Ling, both sides felt that the other party was very unpleasant. In order to communicate well with A Ling, Ji Zhe asked Yan Xi, a girl from Yanbian, China, to be an interpreter. But Yan Xi's accent and her way of translation did not really help. Unexpectedly, as A Ling and Ji Zhe, who was responsible for protecting her, came into contact more, the two fell in love. Is it not enough that the violent factors of underworld families have to be "introduced" from abroad?