"Together as One! Hello, we are TO1!" TO1 (티오원), formerly known as TOO (티오오) is a 10-member boy group managed by n.CH Entertainment with production and marketing by Stone Music Entertainment. They were formed through the survival show World Klass and officially debuted on April 1, 2020 with their first mini album Reason for Being : Benevolence.
Their name is an acronym for "TOgether as 1".