Quick Explanation!! Recap: There are two separate people playing the role of "mistress": Yoosun and Hyewon. Hyewon is the real mistress, but she is also a flower maiden. Yoosun acts as her double whenever she is in bloom so that the secret is kept safe. Hyewon wears blue earrings, so when ever she is seen wearing RED earrings, it means that it is actually Yoosun wearing Hyewon's clothes. (Part 1)
Comment by Lesbian Dictionary on Moonlight Garden - Chapter 48
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@Lesbian Dictionary (Part2) Yoosun is revealed to be trying to stop the creation of a cure, because if Hyewon dies Yoosun would No longer be her shado