Choco Bank is about a guy named Kim Eun-haeng (Kai), 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 money. Eun Haeng (meaning Bank in Korean) will deal with the concerns many in their 20s struggle with when they start working for the very first time. And a girl named Ha Cho-co (Park Eun-bin) 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.