Ji-woong (Song Joong-ki) has been idle all day after graduating from university. One day, he met Hong-sil (Han Ye-seul), a strange woman who jumped over from the opposite rooftop to pick up bottles. Hong-sil, who is very greedy, has set her sights on the relocation fee of Ji-woong's residence. She secretly finds Ji-woong's landlord and changes the rental contract to her own name, making Ji-woong homeless. Seeing that the other party is still optimistic, Hong-sil is touched and promises to help him save a huge sum of money in a short period of time. Ji-woong, who is unaware of it, is grateful for Hong-sil's "kindness". He began to learn to obey Hong-sil's orders unconditionally, but his often exposed prodigal nature always annoys Hong-sil. Although Hong-sil is extremely stingy, she also has a woman's dream deep in her heart. She gave the money she saved hard to her lover (Lee Sang-yeob) for custody, hoping that one day she can become a good woman worthy of the other party. Unexpectedly, one day her lover and her lover ran away with the money, which hit Hong-sil hard. Ji-woong finally learned the inside story of his homelessness. Will he forgive Hong-sil, who feels that he has been used?