Highlight, VICTON, Oh My Girl, and GOT7 will be representing, respectively, idols in their 1st, 2nd, 3rd, and 4th year of debut. (Highlight's years are counted after 'redebuting'.) The four groups will be representing idols in their respective debut years for the first part of the 10th-anniversary special.
After the four teams, other idol groups in their 5th, 6th, 7th, 8th, 9th, and 10th years since debut will be coming onto the show. There aren't that many groups that have managed to make it over 7 years. Who do you think each year will be represented by?