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)