Teddy Yu is a former secret agent turned chiropractor who thought he left his past behind. He teaches martial arts to his two kids. However, his past catches up to him as a rogue agent demands to know the whereabouts of an agent known as Dragon. Now, father and children must team up to stop the rogue agent and his goons.

Yin, a ten-years-old boy, grew up in a single parent family, gangs up with bad peers and spend most of his time in video game parlours. One day, Tin is egged on to take part in a theft, and event that will leave an indelible memory in the young delinquent's heart...