[Seven O'Clock - ECHO] Debut Stage | M Countdown 170316 EP.515

- KPOP Chart Show M Countdown | EP.515 - Seven O'Clock - ECHO▶Watch more video clips:http://bit.ly/Mcountdown-Kpop2017[Kor Ver.]실력파 아이돌로서 가요계 첫 걸음 내딛는 '#세븐어클...