CLASS:y(클라씨) "Tick Tick Boom" Dance Practice Video #2 ---------------------------------------------- CLASS:y OFFICIAL CHANNEL ❥• Twitter : https://twitter.com/M25_CLASSy ❥• Instagram : https://instagram.com/m25_classy/ ❥• Facebook : https://facebook.com/M25.CLASSy ❥• YouTube : https://www.youtube.com/channel/UCbCyYn2M_1ccicwj-KU7t0Q