Having appeared for SECRET's 'Shy Boy' Valentine's special stage on Music Core yesterday, the MBLAQ boys now turn their attention to f(x)'s Sulli on Inkigayo. With the tune of J.Y. Park's "Proposal", MBLAQ's Seungho charmed Sulli with a sweet piano performance and then they were joined by Thunder and G.O for a couple dance together. Mir and Lee Joon did not participate due to illness.