So I didn't choose such reckless songs [flowery or high-pitched], and tried to avoid challenging, something too new.Lee Su-ho from South Korean online magazine IZM described I as a pop rock album with a balladic production.

[7] Meanwhile, Chester Chin from Malaysian newspaper The Star noted elements of soft rock on the EP, a genre that is contrary to Girls' Generation's common bubblegum pop and electronic sound.

Lee Su-ho from South Korean online magazine IZM praised the EP's pop rock and balladic musical styles; they further hailed I for showcasing Taeyeon as a talented vocalist.

[7] Chester Chin from The Star labelled the album as "a collection of dynamic K-pop confections" with "refreshing" elements of soft rock as opposed to Girls' Generation's signature bubblegum and electronic sound.

[17] The EP entered the Billboard World Albums and Heatseeker charts at number one and five, respectively, selling 2,000 copies in the first two days of its release in the United States.