Lok Tin Yau (Wong Hei) has dreamed of becoming a firefighter since he was young, because he was saved by a brave firefighter once. His mother initially did not allow him to be a firefighter for fear of his safety. However, Yau managed to convince her otherwise. His childhood friends, Ng Dai Heng (Chin Ka Lok) and Sze Tou Bat (Joe Tay) joined the Pat Heung Academy with Yau, too. Lau Hoi Pak (Louis Koo) is the son of a rich man, but he is forced to become a firefighter after his father refused to give him any more money. Pak then leaves his home with his autistic brother, Bou Bou, and goes to Pat Heung as well. Sum Pik Yiu (Esther Kwan) is a working lady with a steady boyfriend of 8 years. But her life is not trouble-free: she loses her job, her family is in debt, and she discovers her boyfriend cheating on her. In order to start anew, she joins Pat Heung to become a firefighter.