The viewers' curiosity levels spiked after the appearance of Lee Sung Kye on "Great Doctor."
On the Tuesday episode of "Great Doctor," Yoo Eun Soo (Kim Hee Sun) is seen having a mental breakdown from being exhausted and finds herself unable to go back home. In order to find her notebook and go back, she decides to confront Ki Chul (Yoo Oh Sung). She goes to find him and requests that he give back her surgical tools.
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With the returned tools, she performs surgery on a high ranking official's son and though she had no idea, the boy was Lee Sung Kye, who will eventually end the Koryo Dynasty and begin Chosun as its first king. He is the man who ultimately will be the cause of Choi Young (Lee Min Ho) 's death.
Yoo Eun soo finds this out later and is shocked at the fact that she is having an influence on history. If she hadn't performed the surgery, Koryo wouldn't have fallen and perhaps Choi Young would have lived.
Internet users responded saying, "The drama always leaves you guessing," "Lee Sung Kye? I don't even know how this will end anymore!", and "Can't wait for the next one!"