SECRET's Song Ji Eun finally held her first solo comeback stage for "Going Crazy" on this week's episode of MBC's "Music Core"! Released earlier this week, "Going Crazy" is a smooth R&B/hip hop track co-produced by Kang Ji Won and Kim Kibum. Unlike the cute image SECRET showed in their previous promotion, Ji Eun aimed to express her power as a vocalist with a unique concept change. Check it out below with her featuring rapper, Bang Yong Guk! Source: TV Report via Nate