Seo Jung tries her best to be the first assistant of Chairman Shin’s operation and with her ceaseless efforts, Master Kim appoints her as the first assistant. Meanwhile, three suspected patients of MERS visit emergency room of Doldam Hospital, and Dong Joo decides to shut down the emergency room.

Seo Jung decides to treat the patients in the emergency room after Dong Joo faints. At the same time, Master Kim receives the results of MERS test. Meanwhile, Dong Joo gets well and decides to get a Christmas present for Seo Jung.