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Choi Yu Na returns from overseas to celebrate her brother Choi Woo Chan's birthday. However, his fiancée, Song Ji Yeon, insists that Yu Na is a mistress. The misunderstanding quickly escalates into malicious bullying, and Yu Na suffers a miscarriage. Upon learning what happened on the wedding day, Woo Chan vows to clear Yu Na's name. Ji Yeon and her family beg for mercy, but in the process, they inadvertently reveal their ugly true colors and a shocking conspiracy.