BtoB has revealed that contrary to popular belief, the group do not contact each other often, saying this is the secret behind their longevity as a team.The singer-actor recently made a guest appearance on singer Jung Jae-hyung’s YouTube series, Fairy Table on its March 31 episode. Over the course of the hour-long episode, Jung asks Sungjae about his years-long experience in the K-pop industry.“You’ve been in the K-pop scene for quite a while. Right, Sungjae? It seems like many K-pop idols burn out after about 10 years.