What EP was released in 2016 by a girl group, of which one member was also known for playing the main character in the drama "School 2017'?
I.O.I:  The group was composed of eleven members chosen from a pool of 101 trainees from various entertainment companies: Lim Na-young, Kim Chung-ha, Kim Se-jeong, Jung Chae-yeon, Zhou Jieqiong, Kim So-hye, Yu Yeon-jung, Choi Yoo-jung, Kang Mi-na, Kim Do-yeon and Jeon So-mi. Kim Se-jeong:  She is also known for playing the main character in the drama "School 2017".
i don't know