"I" is a Korean song recorded by South Korean singer Kim Tae-yeon (better known by her mononym Taeyeon) featuring Verbal Jint, taken from Taeyeon's debut EP of the same name. It was written by herself, Mafly, and Verbal Jint, and produced by Myah Marie Langston, Bennett Armstrong, Justin T. Armstrong, Cosmopolitan Douglas, David Quinones, Jon Asher, and Ryan S. Jhun. It was released digitally on October 7, 2015 in conjunction with the release of the EP, and was released on Korean Broadcasting System's "K-Pop Connection" radio on October 9.

Musically, "I" is a pop rock song that, according to Jeff Benjamin from Billboard magazine, bears resemblance to songs by American singer Taylor Swift. Upon its release, "I" received generally favorable reviews from music critics, who praised its musical styles and Taeyeon's vocals. The single peaked atop the South Korean Gaon Digital Chart and has since sold over 1.46 million digital copies. To promote the song and the EP, Taeyeon made several appearances on music programs including Inkigayo, Music Bank, and M Countdown.

South Korean singer Kim Tae-yeon (better known by her mononym Taeyeon) is a member and the leader of popular girl group Girls' Generation. She has been widely recognized as a talented vocalist, yet had never ventured to record her official solo album until 2015. Taeyeon's vocal abilities are showcased on tracks she recorded for Korean films and televisions, including "If" (Hong Gil Dong, 2008), "I Love You" (Athena: Goddess of War, 2010), and "Closer" (To the Beautiful You, 2012). In April 2015, Taeyeon is featured on labelmate Amber's song "Shake That Brass" for her debut extended play Beautiful, which generated much attention from the public.

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