Choco Bank is about a man named Kim Eun-haeng (Kim Jong-in), a college graduate entering the workforce. His father made sure he had a lucky start in life by giving him a name that means "bank" in Korean. He will deal with the concerns with which many in their 20s struggle when they start working for the first time.He was unemployed for five years. He later meets a girl named Ha Cho-co (Park Eun-bin) who is preparing to start a business. The story plays out as the two find out more about the financial service industry...Many things come to turn them apart but still they end up together...