Name: Seo Chang Bin
Birthday: August 11, 1999.
Birthplace: Yongin, South Korea. 
Raper, composer, producer, vocal, dancer.
Part of the subunit 3RACHA y known as Spear B.
Nicknames: Baby Changbin, pigbunny, Binnie
He is known for making the best aegyos, he is the most prominent rapper in the k-pop industry, in the group, the kids consider and treat him as a baby.
SKZOO: Dwaekky