Sung Si Kyung and IU have revealed another Christmas story MV teaser for their duet single "First Winter".

In the duo's latest teaser, a woman and man have a romantic meeting under a lit-up Christmas tree. Back in 2010, Sung Si Kyung and IU collaborated together for Sung Si Kyung's "It's You", and their upcoming duet is expected to be a warm, emotional winter theme.

Sung Si Kyung and IU's upcoming song drops on December 9 KST. Watch the "First Winter" MV teaser above!