For a year, people learn to live with the spheres without suffering any specific changes. Even with the alien-looking spheres floating all over the sky, the CSAT is what matters the most to seniors of Sungjin High School. When the exam is just around the corner, one of the spheres drops on a military camp for the first time, and more shocking news awaits them.
Actores
Ahn Da-eun , Ahn Do-gyu , Choi Moon-hee , Hong Xa-bin , Ji Min-hyuk , Kim Ki-hae , Kim Min-chul , Kim Su-gyeom , Kwon Eun-bin , Lee Soon-won , Lee Yeon , Lim Se-mi , Moon Sang-min , Ro Jong-hyun , Shin Hye-ji , Shin Hyun-soo , Shin Myung-sung , Shin Su-hyun , Sohee , Woo Min-kyu , Yeo Joo-ha , Yoon Jong-bin
