Ace reached number one on the weekly At South Korea's annual music awards,
Ace won the Album Bonsang at the
29th Golden Disc Awards, and received further nominations at the
Gaon Chart K-Pop Awards and
Seoul Music Awards. Korean music publication
Weiv described the track "Danger" as "[...] a song that showcases the bright sense of Thomas Troelsen good at using multiple tracks, stands out. Most of all, it is a rare song among recent SM songs which doesn't tire you after many replays." 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.
IZE said "the young mysterious thief character with light moves but serious business came to life with Taemin's performance."
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". She explained that collaborating with
Kai allowed them both to overcome their weaknesses. ==Track listing==