Song Dong Geon is a South Korean idol. He was a contestant on the survival show "World Klass", where they gained a place as a vocalist in the boy group "TO1." He is a former C9 Entertainment trainee. TO1 initially debuted under the name TOO in 2020 after being formed on the Mnet survival show “World Klass,” and they rebranded as TO1 in March 2021. On May 24, 2022, WAKEONE Entertainment announced that the group would be temporarily halting all activities to reorganize. TO1 contract with their agency WAKEONE ended on December 31, 2023. (Source: Soompi) Watch drama online for free.