Xiao Feng is the Deputy Chief Physician of the Cardiology Department at Dongli Hospital. He is introverted and strict. He becomes work partners with the impulsive doctor Lin Yi, yet friction arises due to the differences in their medical beliefs. Meanwhile, Xiao Feng's younger sister also gets a job working as a doctor at the Intensive Care Unit.

• Mark Chao
• Mao Xiaotong
• Jin Shijia
• Chen Haoyu
• Yutong Zhao
• Jin Shikang
• Joan Chen