Kim Hee Sun attempts to cure herself from poison with a different one.

On the Monday episode of SBS "Great Doctor," Eun Soo (Kim Hee Sun) tries a method that Jang Bin (Philip Lee) had written down before. The method called for a different poison to counteract a poison that was already in your body.

Servant Choi doesn't think that this is a good idea for Eun Soo because it's dangerous to use a similar poison to overpower the other one and tries to tell her to not do it. 

However, when Eun Soo realizes that she is getting a slight fever, she doesn't believe there is any other way. 

Choi Young also was against what she was doing because he realized there was nothing he could do until the doors openeed for her. She was adamant that this was the only way and uses the other poison.

Eun Soo begins to get sicker as the night goes by and Choi Young leaves her side only to see that Ki Chul (Yoo Oh Sung) was conducting an uprising. Meanwhile, Eun Soo wakes up from her feverish state and viewers wonder if it means that she has succeeded.