Up10tion (Korean: 업텐션; commonly stylized as UP10TION; pronounced eobtensyeon for "up tension", acronym for Unbelievable Perfect 10 members Teenager Idol Open Now) is a South Korean boy band formed by TOP Media in 2015. The group consists of ten members: Jinhoo, Kuhn, Kogyeol, Lee Jin-hyuk, Bitto, Kim Woo-seok, Sunyoul, Gyujin, Hwanhee, and Xiao. The group debuted with an extended play Top Secret. In 2017, they made their Japanese debut with EP ID.