ASTRO's MJ makes a cute mistake toward sunbae Sung Si Kyung on 'Duet Song Festival'

The two prepared a brief live of Sung Si Kyung's "You Touched My Heart", to the delight of the sunbae singer, who is an MC on the show. With Sanha on the guitar and MJ on vocals, the two started off great, but MJ suddenly apologized midway, saying, "Aw I'm sorry! I messed up the lyrics!" 

But the MCs and panelists were quick to forgive them, pointing out that even when apologizing for his mistakes, MJ was adorable.