First Winter" (첫 겨울이니까) is the collaboration single by Sung Si Kyung and IU. It was released on December 9, 2019. Track list "First Winter (첫 겨울이니까)" - 4:00 "First Winter (Inst.)" - 4:00 References Video links Music video Teaser #1 / #2 Making film This article is a stub. You can help Kpop Wiki by expanding it. Retrieved from "https://kpop.fandom.com/wiki/First_Winter?oldid=180956" Categories: Single article stubs Singles Digital singles Collaborations Sung Si Kyung IU 2019 releases 2019 digital singles Community content is available under CC-BY-SA unless otherwise noted.