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. Meanwhile, Kang Ma Roo (Lee Jae Joon) is a kind and simple young man. He is naive about the world.

Ahn Tae Ho (Kim Min Soo) is the section chief of a company. He is an ambitious man. Ahn approaches Choi Ah Ran (Seo Yi Ahn) who 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.