Age: 27 Position: Leader, Main Vocalist Role: Eldest Traits: Perfect variety star, lowest in the BTOB hierarchy, active in musicals. Though he's the loud one at the bottom of the hierarchy, he isn't a leader to be taken lightly. He jokes around, but he shows his leadership and eldest-brother side when it comes to managing BTOB. He is an absolute master singer. Even off-camera, his energy makes everyone around him laugh. Promotes as Seo Eunkwang for solo activities. He is deeply devoted to Melody (the fandom).

Age: 27 Position: Main Rapper Role: Second eldest (same age as Eunkwang) Traits: Always sweet, great singer, composes BTOB's hit songs, radio host. He is the same age as Eunkwang and, despite being a rapper, is a skilled vocalist. His hobby is working out, so he has a great physique. He's often called the most 'normal' member of BTOB, but at the end of the day, he's still a BTOB member. Promotes as HUTA for solo activities. His love for Melody (the fandom) is immense.

Age: 26 Position: Lead Vocalist Role: Third eldest Traits: Intro fairy, high public recognition, active in musicals, very close with Yook Sungjae. He could easily be voted the loudest member of BTOB. He's scary when angry, but he almost never gets mad and sits at the bottom of the hierarchy with Eunkwang. He's a hilarious member who bickers a lot with Yook Sungjae. Promotes as Lee Changsub for solo activities. His love for Melody (the fandom) is immense.

Age: 25 Position: Lead Vocalist Role: Fourth eldest Traits: The father of BTOB's music, senior/mentor image, charming deep voice. The man responsible for the songs that brought BTOB to where they are today. He's the 'quietly crazy' type but is just as loud as the rest of BTOB. He can play various instruments. While his low notes are charming, his range is incredibly wide, making his high notes impressive too. He has the largest vocal volume in BTOB. He often makes BTOB explode with laughter with a single impactful word at key moments, and was even voted the #1 funniest person recognized within the group. Promotes as Lim Hyunsik for solo activities. His love for Melody is immense.

Age: 24 Position: Main Dancer, Lead Rapper Role: Fifth eldest Traits: The only foreign member, specializes in singing-rap. Though he's from abroad, his Korean is perfectly patched. He usually speaks Korean and occasionally uses English. He has a subtle craziness to him. He might actually be the biggest prankster in BTOB. True to the group, he's loud, funny, and does it all. Promotes as Peniel for solo activities. His love for Melody is immense.

Age: 22 Position: Sub-vocalist Role: Sixth eldest Traits: Handsome weirdo, visual member, acting idol. He is incredibly loud. He's the member who embodies BTOB's 'crazy' energy. He has great chemistry with Lee Changsub and is truly the craziest of the crazies. He owns the nickname 'Yook-Jal-Tto,' which is short for 'Yook Sungjae, the Handsome Weirdo.' He loves playing pranks. When he's with BTOB, he's a total attention seeker, but he pretends to be normal during solo activities. Promotes as Yook Sungjae for solo activities. His love for fans is immense.