2NB () is a South Korean R&B duo formed by Friday Entertainment in 2006. The duo consisted of Heo Sol-ji and Kim Song-yi. They released their debut single "The First Fragrance" on March 31, 2006. The group disbanded in 2012. Shortly afterwards, the former became the main singer of the girl group EXID, which debuted that same year. In 2015 Kim Song-yi became the lead singer of the girl group Blady. In 2016, 2NB came back with two new members Son Yoo-na and Kim Hyo-jin.