Vocal group M. Street broken their three-year hiatus with a powerful comeback performance on Mnet's 'M! Countdown'! The group first debuted in 2004 with "Boys Story", and though they received a strong following, they unfortunately had to endure much obstacles and tragedy. In 2008, their leader Lee Seo Hyun committed suicide, leading the other members to leave the group or voluntarily enlist for military service. Representatives of the group stated, "For the past three years, they've done nothing but practice their singing. They'll be returning with vocal talent that has improved beyond imagination. Many fans that have been awaiting their return have been calling the office for further details." Check out their comeback below with "Loosen The Necktie"! Tip: Happy