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:  They debuted on May 4, 2016 with the EP "Chrysalis" and actively promoted as a whole and as a sub-unit for less than a year. Kim Se-jeong:  She is also known for playing the main character in the drama "School 2017".
i don't know