"First Christmas" is a song by Joy (from the South Korean girl group Red Velvet) and Doyoung (from the South Korean boy group NCT). The song is a duet released as part of the SM Station project, which showcases collaborations between artists from SM Entertainment. The lyrics of "First Christmas" describe the anticipation and excitement of spending the first Christmas together with a loved one. The song starts by expressing the happiness of meeting each other for the first time during Christmas. It talks about the snow falling and covering the world, creating a magical atmosphere. The narrator eagerly awaits the arrival of their loved one every day, hoping for their presence during this special time. The chorus represents the transformation of the narrators' genders, with Joy singing that she has become a woman after meeting her loved one, and Doyoung singing that he has become a man. This signifies the growth and maturity they experience after falling in love. They express their gratitude to each other for changing their lives and making them complete. As the song continues, it describes walking together in the snowy streets and still feeling like they are walking in a dream. The narrator leans on the loved one's shoulder, whispering words of love and cherishing their moments together. The lyrics highlight the beauty of love and the memorable atmosphere of this special Christmas night. Overall, "First Christmas" is a romantic and heartwarming song that captures the joy and excitement of spending the first Christmas with someone special.