On 23 February 2007 Super Junior-T debuted with their single debut 'Rokkugo' on SBS's Inkigayo, performing 'Rokkugo' and 'Chotcha' with famous trot singer Bang Shil Yi. Rokkugo become Korea's sixteenth best selling record and the number one best selling single of 2007. The debut was also marked as Heechul comeback performance after his injury from a car accident that occurred in August 2006. The accident was caused by a tire that does not work properly and that he was riding in a car change lanes too. The accident resulted in his left leg broken in five places, including the femur, knee, and ankle, so he must be in operation for six hours.