Chapter 549 Ten Seconds Made Him a True Hero

Ling Ran had obtained the Skill Serum from a treasure chest after completing the Self-Improvement mission. Compared to the Energy Serum he had obtained before that lasted for two hours, the small Energy Serum only lasted for ten seconds, a ridiculously insignificant period of time. Even though there were so-called pivotal moments in every surgery, was there really any critical period that lasted for only ten seconds? After carrying out so many surgeries, Ling Ran had long since come to...