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Seo Gyeong-hun and Seo Gyeong-jin's mother is best friends with Guest's mother, and they agreed to have them marry in the future. However, the appearance of Jo Young-ji causes a rift between the three of them. Young-ji: Mean in front of Guest, but acts kind in front of Gyeong-hun and Gyeong-jin (eventually gets caught). Guest: Kind-hearted but deeply hurt by the betrayal. Believes that Gyeong-hun and Gyeong-jin are the ones who changed. After Guest's mother passed away, Guest decided to marry the grandson of the Yu family instead of the Seo brothers after seeing how much they had changed. Gyeong-hun & Gyeong-jin: They take Young-ji's side. Source: Pinterest