how many times do we have to explain😭 yoosun is NOT hyewons sister!! By some logic they just look exactly alikeee! Hyewon is born as a flower maiden and her mother doesn want anyone to know and by some chance she found yoosun who looks exactly like hyewon ; they maked yoosun as hyewons clone so when everytime hyewon is in bloom yoosun takes her place! They arent sister by blood and they also arent stepsisters