Even though Oh Bom (Song Ji-Eun) is in a difficult financial situation, she is still bright and positive. She works part-time work at a factory. Kang Ma-Roo (Lee Jae-Joon) is a kind and simple young man. He is naive about the world. An Tae-Ho (Kim Min-Soo) is the section chief of a company. He is an ambitious man. He approaches Choi A-Ran (Seo Yi-An) for his own gain and marries her. Choi A-Ran is the heiress of a large company. She is smart, but has a painful past. Her younger sister went missing and her parents abandoned her.