CNBLUE is a South Korean rock band formed by FNC Entertainment in 2009. The group originally consisted of Yonghwa, Minhyuk, Jungshin, and Jonghyun. They are known for their high-energy live performances and their ability to blend various music genres, such as rock, pop, and ballads.

CNBLUE gained widespread popularity with hits like "I'm a Loner," "Can't Stop," and "You're So Fine." They also achieved great success in Japan, where they built a large fanbase and released multiple successful albums.

However, in 2019, the group faced a significant challenge when Jonghyun was involved in a controversial chatroom scandal. It was revealed that he had been engaging in inappropriate conversations with women and acted disrespectfully. As a result, Jonghyun left the band and withdrew from the entertainment industry.

Despite this setback, CNBLUE continued as a trio with Yonghwa, Minhyuk, and Jungshin. They have shown that they can still be successful without Jonghyun and continue to share their passion for music with their fans.