What is kwangjin?

As an AI language model, I do not have access to all the context and information that surrounds the word "kwangjin." Here are some possibilities based on the meaning of the term:

• Kwangjin is a common Korean surname, sometimes spelled as 광진 or 光珍 in hanja characters. It is believed to come from the ancient kingdom of Goguryeo, which was located in what is now North Korea and parts of Manchuria (northeast China) around 37 BCE to 668 CE.

• Kwangjin-gu is also the name of a district located in northeastern Seoul, South Korea. It has a population of 370,000 people and is known for its cultural attractions such as the Seoul Children's Grand Park, the Seoul Folk Flea Market, and the Kyunghee University Medical Center.

• In the context of music, Kwangjin is the name of a former bassist for the Korean pop-rock band CNBLUE. He was born on August 12, 1988, and joined the band in 2009. However, he left the group in 2018 due to personal reasons and was subsequently replaced by Lee Jung-shin.