아이오아이 유닛 카운트다운 1 season · 2016 · Ongoing ★★★★★0.0 EpisodesAll seasons S01 · E01 Episode 1August 8, 2016Cast Lim Na-young Kim So-hye Kim Do-yeon Zhou Jieqiong Choi Yoo-jung Chungha Jeon Somi ← All series