: The drama retells the classic Goguryeo folktale of Princess Pyeonggang and On Dal . Pyeonggang is born a princess but raised as an assassin (Yeom Ga-jin) who eventually seeks to reclaim her throne.
Why 2021? Why the moon? And why does this matter?
: This leads to a series of suggestive and complicated interactions between her and her son-in-law, often involving themes of guilt and secrecy.