Genius surgeon He Zhizhou, due to past trauma, hid his identity and came to the Jiangcheng First Hospital Emergency Department, becoming a universally despised "slacking" resident. Yet every time a life-or-death crisis strikes, he always manages to turn the tide with exquisite medical skills, making the whole hospital shift from skepticism to kneeling and begging him to act. As his identity and past events surface, with the support of his companions, he picks up the scalpel once again, uncovers the truth of the past, and guards his original aspiration of saving lives and healing the wounded.