Choi Yu-na returns to Korea after a long absence, having been abroad for the wedding of Choi Woo-chan, the CEO of Woosung Group. For her brother's wedding, Choi Yu-na offers a large sum of stock and a luxury home as a betrothal gift, but is mistaken for an adulteress by Choi Woo-chan's fiancée, Song Ji-yeon. The misunderstanding soon escalates into harassment, and Choi Yu-na ultimately faces the tragedy of a miscarriage. On the wedding day, Choi Woo-chan, having learned the whole truth, is enraged and vows to clear his sister's name. Meanwhile, the fiancée's family, realizing the truth, belatedly seeks forgiveness, but in the process, their hidden ugly faces and wicked schemes begin to be revealed one by one.