Jang Dae Hyeon became famous in Season 2 of Produce 101 for his baby face, round glasses and smooth raps.
Everyone who watched the show will remember his hilarious reaction to a ghost prank where he fell off his chair in fright.
He was known for being a bit awkward.
Fans thought he might debut styled like 10cm, a Korean duo with similar looks.
But now he’s debuted and he looks so completely different that some fans didn’t even recognize him!
He lost weight and changed his hair to become a bit more stylish, but it also seems as if his entire confidence changed.
Daehyeon debuted as a member of RAINZ who just released a second mini album called Shake You Up.
Watch them perform their comeback track “Turn it Up” here: