1THE9 (원더나인) is a nine-member project boy group managed by MBK Entertainment. They were formed through the competition reality show Under Nineteen and are set to debut on April 12, 2019.^[1] The group is under a 17-month contract; 5 months of training before promoting for 12 months.

Check out 1THE9 Members Profile! - https://www.youtube.com/watch?v=44cjKXhzcfI&t=29s