Following the death of his wife, Cheung Wai-sum (Ali Lee) in a hit and run accident, Principal Ambulanceman Mak Choi-tin (Joe Ma) lives with his only daughter Mak Lok-yee (Bianca Chan), sister Mak Oi-fah (Pinky Cheung) and sister-in-law Cheung Ho-kei (Moon Lau). Young and hopeful, subordinate Cheuk Ka-kit (Matthew Ho) is impulsive and clashes with Choi-tin's life. In addition, Tam Ka-chun (Joey Law), the superior of the trainee ambulance officer, pursues perfection and picks on Ka-kit, causing the pressure on the team to greatly increase. Being the middleman, Choi-tin works hard and strives to maintain the unity and cooperation spirit between the team members. He also hopes to cultivate outstanding ambulance elites, rescuing more precious lives in challenging situations...