The exclusive TBJ model BtoB (Yook Sungjae, Lee Minhyuk, Jung Il-hoon, Pniel, Lim Hyun-sik, Lee Chang-sub, Seo Eun-kwang) fan signing ceremony was held at Nowon branch of Lotte Department Store in Nowon-gu, Seoul on the afternoon of September 16.
BtoB (BtoB) Yook Sungjae is entering the day.
You Yong-ju
About Lee Chang-sub
Lee Chang-sub, better known mononymously as Changsub, is a South Korean singer, songwriter, host and musical actor. He is a lead vocalist of the South Korean boy group, BtoB.
 Wikipedia