Interest in green bonds is on the rise. A total of 12.624 trillion won in green bonds have been issued so far since the Korea Development Bank first issued green bonds in 2018. However, the terms such as green bonds, ESG bonds, and socially responsible investment bonds are used interchangeably, causing confusion. This report is for those who have heard of green bonds but are unfamiliar with them yet are curious about how they are issued, how much they return, and whether there is a possibility of greenwashing.