Super Junior's Yesung and f(x)'s Luna will be teaming up to release a duet track titled, "And I Love You", for KBS's "President, OST Part 2." The song was produced by Lee Sang Joon (of Taeyeon's "Can You Hear Me") and lyricist Bae Hwa Young; it's been determined to be used as the drama's 'love theme'. Super Junior's "Biting My Lips" (which was released in part 1 of the drama's OST compilation) performed well on the charts, and it's expected that the addition of this duet ballad will skyrocket the group's OST songs to even greater popularity. Achieve Group DN, the production company for the OST, commented, "The harmonization of their voices was exceptional.  The sad melody and emotional lyrics mesh well together in creating a luxurious ballad track that will surely be the best of this winter season." "And I Love You" will debut on the December 23rd episode of "President', and it will be available on the 30th. Source: Sports Today via Nate