Ace is the debut extended play by South Korean singer Taemin.

"[14] In a review for the publication, Park Jun-woo said that the EP showed that Taemin had become an adult, contrasting with his image as the youngest Shinee member.

He observed that it was unusual for a member of an SM group to release a solo album.

[15] IZE said "the young mysterious thief character with light moves but serious business came to life with Taemin's performance.

"[16] IZM reviewer Jeong Yu-na noted the influence of Michael Jackson and felt that the EP displayed Taemin's growth as a vocalist.

She particularly highlighted "Danger", which she thought created a synergistic effect when combined with the choreography, and "Pretty Boy", which she described as a "hidden weapon".