Anna Jo (
Han Ye-seul) is a rude, spoiled, arrogant and impossible-to-please American-bred heiress. She returns to Korea only to continue being a controlling wife to her already cowardly husband, Billy Park (
Kim Sung-min). When her yacht gets stuck for repairs, she hires local handyman Jang Chul-soo (
Oh Ji-ho) to fix her shower, but when they have a heated spat over her dissatisfaction with his work and refusal to pay, she pushes him overboard and dunks his tools into the ocean right along with him. Later, after a quarrel with Billy that threatens to end their marriage, she herself gets drunkenly pitched overboard and falls victim to a bad case of
amnesia. In the hospital, she ends up beside none other than Chul-soo, who's still recovering from his own swim in the ocean for his lost tools. Unknown to her, he's been raising his three orphaned nephews in their unkempt house and desperately needs a nanny. Taking advantage of her memory loss, he manages to convince her that she's his live-in girlfriend and renames her Na Sang-shil. But he didn't expect her spoiled selfishness to slowly turn into compassion. And he didn't expect to fall overboard again — this time, for her. ==Cast==