Wei Jie and Jian Ren are best friends. Wei Jie's father is a gambling addict and his mother does not think highly of him. Jian Ren comes from a well-to-do single parent family and has an estranged relationship with his mother. He is rebellious and is a runner for the loansharks. They both share the talent on gadget invention but their efforts are never recognized. Until their lecturer, CK, helps the boys invent a gadget, which is misused by the loansharks to do evil. In an attempt to stop them, CK, Wei Jie and Jian Ren's lives are at risk.