在这个世界上，有些事件的发生概率几乎是零，但它还是有可能发生。32岁的业余配音演员崔美子（艺智媛 饰）似乎集合了世上所有发生概率为零的倒霉事，长相平平、胆小怕事、没有稳定工作，如果这些都不算什么的话，那么年逾30的她至今未婚，甚至连男朋友也没有，这可的确算是悲剧了。在一次配音的工作过程中，崔美子遇到一个比自己小的帅哥上司池PD（池贤宇 饰），在经历一次次的误会和较量之后，两人居然相互萌生好感。可爱的家人们面对美子突然带回家的年轻帅哥兴奋不已，他们鼓励美子一定要抓住这份天赐良机。当崔美子的可爱家人们也正在各自沉浸在自己或喜或悲的生活之中时，大龄无业女青年和年轻帅哥一起谱写了一曲王子和公主的美妙恋曲……

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A year after Ruri's death, unaware of the truth, Mirae still resents Haru, who was with Ruri when she died. On Ruri's anniversary, Mirae visits their old hideout—a place full of memories—and unexpectedly meets Haru. There, she learns Ruri had gone to Itaewon to buy costume materials to surprise her. Through this encounter, Mirae and Haru begin to understand each other's pain and start to heal together.

Haeryu,' a young man who can't live according to his will due to his sick mother, one day accidentally falls into the water from a bridge. In a precarious situation that makes him think of death, Haeryu is rescued by Gon, a mysterious man who appears with a school of fish. Haeryu sees the 'gills' beneath Gon's ears. After this incident, Haeryu begins searching for the man who has saved her life and happens to meet Gangha, from whom she hears about Gon's past.