A romantic music coming-of-age drama about grandmother Oh Mal-soon, who turns into a 20-year-old Oh Doo-ri overnight and enjoys her shining prime once again.

Even in the harshest environments, firefighters must focus on extinguishing fires and rescuing everyone there. At 3:47 AM on March 4, 2001, the 119 emergency call center receives a phone call about a fire that has broken out in the Hongje-dong neighborhood. Firefighters, including newcomer Cheol-woong, rush to the scene.