Choco Bank is about a guy named Kim Eun-haeng, who is a college graduate entering the workforce. His father made sure he had a lucky start in life by giving him a name that meant the word bank. Eun Haeng will deal with the concerns many in their 20s struggle with when they start working for the very first time. He was unemployed for five years. He later meets a girl named Ha Cho-co who is getting ready to start a business. The story plays out as the two meet and find out more about the financial service industry.