Zhang Chi, a young and promising attending physician, left the Department of Thoracic Surgery of a Class-A hospital due to a medical accident and came to the emergency center. Qi Ji, a female emergency doctor who was seven years younger than him but experienced, became his instructor. Sudden situations, complex doctor-patient relationships, and high-intensity physical exertion all exposed Zhang Chi's shortcomings as a newcomer. Zhang Chi, who had a strong personality, had constant friction with Qi Ji, who was strict in teaching. At work, Zhang Chi met emergency doctors Xu Chengyuan and Zheng Bo, and dispatcher Sun Jiaqi. While pursuing the value of life, the five young people also collided with emotional sparks. All kinds of emergency work allowed Zhang Chi to see the warmth and coldness of the world between life and death, and gradually recognized the emergency work. He was even more shocked and attracted by the chivalry unique to emergency doctors in Qi Ji, and their feelings also heated up in emergency events. However, a traffic accident 20 years ago caused their love to fall into the grievances of the two families. Just when Zhang Chi reluctantly decided to study abroad, a viral pneumonia epidemic broke out. He chose to go against the flow and fight side by side with emergency doctors, sticking to the 120 emergency front line to fight the epidemic together. Zhang Chi returned to the peak of his career, and his love with Qi Ji finally came to fruition. With the help of Qi Ji, he untied the knot with his father and gained long-lost family affection, sincere friendship and sweet love.