A nonsensical coincidence leads to the encounter between the amnesiac heroine and the infatuated hero. A misstep on the stairs allows the heroine to regain her past memories. Whether it's sadistic or mixed, the male protagonist's infatuation and reluctance become the only way to reunite. The female protagonist's stupidity brings the lost love to the surface. Perhaps misunderstanding between lovers will become a drawback that hurts each other, and it will become a way to deepen the love. In fact, it still has a HAPPY ending.