Betrayed by her best friend, Krystal is sold to the Yang family, as one of the family's household maids. There, she meets Yang Yoseob, the only son and the only heir to the Yang family business. Krystal doesn't take notice of Yoseob at first,  but slowly falls for him unknowingly. Yoseob, on the other hand, falls head over heels for Krystal at first sight. The Yang elders deeply love her and decides to not make her a household maid due to her intelligent and beauty, and decides to appoint h