Every K-Pop boy group is made up of coworkers, but some of those coworkers become more like brothers over time. Like true brothers, they’re always the first to love, support — and make fun of each other. INFINITE members Seongjong (left) and Sungyeol (right) In 2010, INFINITE debuted as a seven-member group with Sungkyu, Dongwoo, Woohyun,…

