Lin Wei, an attending physician in the emergency department, is reborn and returns to the triage desk. Four college students, seeking traffic and views, falsely claim to have cholera and burst into the emergency room carrying unidentified deep-sea specimens. In her past life, Lin Wei softened her heart and let them through, resulting in a devastating epidemic outbreak and her own tragic death. This time, she decisively presses the alarm, initiates Level 1 risk control, and seals off the hospital to isolate the four individuals. The virus research center steps in, discovering that the four illegally broke into the forbidden deep-sea zone of the Bermuda Triangle and brought back bacteria-carrying coral fossils. Wang Yuheng gets infected with an unknown Hanyuan virus, leading to systemic calcification. Enduring family uproar, school pressure, and online public opinion, Lin Wei sticks to her professional judgment, tracks down all close contacts, and finally lifts the lockdown with zero infections, demonstrating a healer's duty and the frontline of public safety.