Lin Feng, an emergency medicine resident who has been in training for six months, awakens a medical system that allows him to see hidden disease alerts in patients. The emergency department is full of life-threatening crises. He sees through a case of massive bleeding caused by liver cirrhosis that was disguised as hemorrhoids, and even saves a patient with tension pneumothorax using a mineral water bottle and an IV tube. Despite being looked down upon by his colleagues, Lin Feng repeatedly identifies dangerous conditions that are extremely easy to misdiagnose. He takes on formidable opponents from prestigious universities in a medical skills competition. While racing against death in the resuscitation room, he also shows compassion and helps suffering patients. With his medical expertise and benevolent heart, he achieves a passionate comeback as a resident doctor.