SECRET's Song Ji Eun concluded her successful solo promotions for "Going Crazy" on today's episode of "M! Countdown". She also celebrated rapper Bang Yong Guk's 22nd birthday backstage. M! Countdown's official Twitter shared, "Today is the day SECRET's Ji Eun concludes her successful promotions through M! Countdown. Celebrating the birthday of her loving stalker, Bang Yong Guk-ssi~ Please congratulate the both of them soon!" Fans commented, "You guys really look good together, like a couple hehe," "Labelmate siblings look so cute!," and "Happy birthday! Looking forward to Bang Yong Guk's debut!" Check out their final performance below! Source: Star News via�Naver