MBC's Music Core is back once again with yet another fun and exciting show! For this week, Lee Jung made his comeback, while SECRET collaborated with MBLAQ for a special Valentine's Day stage. Other performers included TVXQ, Jewelry, INFINITE, G.NA, Dal Shabet, The One, Mighty Mouth (feat. Soya), Navi, Piggy Dolls, LPG, JQT, Old Time, Beige, and�Bye Bye Sea. Check out the videos below! JQT - PeeKaBoo Beige - I Can't Drink Piggy Dolls - Trend Dal Shabet - Supa Dupa Diva Bye Bye Sea - My Heart Speaks Jewelry - Back It Up Navi - Well Done Han Groo - Witch Girl MBLAQ - STAY INFINITE - BTD (Before The Dawn) G.NA - Black & White Mighty Mouth ft. Soya - Tok Tok TVXQ - Why? (Keep Your Head Down)