플레디스
In late 2007, Kahi contacted some friends in the industry at Pledis Entertainment. Together, they planned for and produced a new group. In January 2009, after years of work and selection of members, the group After School was introduced. After School would undergo many member changes and image changes, but Kahi remained as the leader. Rumours of her leaving the group had begun as early as 2010 when Pledis Entertainment initially announced she would release a solo album. In 2010, Kahi joined the cast of reality-variety series "Yeongunghogeol" (, "Heroes").