B1A4 is a South Korean boy band formed by WM Entertainment in 2011. The group made their debut with members CNU, Sandeul, Baro, Gongchan, and Jinyoung. B1A4 is known for their catchy songs, engaging melodies, and talented members. They have released hits like "Lonely", "What's Happening?", and "Beautiful Target", which helped establish them as a popular group in the K-Pop scene.

Unfortunately, some members of the band have left, including Jinyoung, who decided to focus on his acting career. He has appeared in various dramas and films and has made a name for himself as a talented actor. Baro also left the group to concentrate on his acting career and has since been involved in various projects.

Despite the changes in the band’s lineup, B1A4 continued to make music and captivate their fans with their performances. They have shown that they can remain strong as a group and continue to succeed even with member changes. B1A4 remains a beloved boy band in the K-Pop scene and has a loyal fanbase that continues to support them.