A week after its release, "Gee" went number one on Music Bank; however, questions were raised when the group did not appear on the program for unknown reasons, with rumors spreading regarding a possible rift between SM Entertainment and KBS.

[3] "Gee" first tied with "Nobody" by the Wonder Girls for the longest-running number one on music portal M.Net (6 weeks).

[11][12] "Gee" topped Cyworld's hourly music chart on the release day.

[14] "Gee" was also ranked as the number one song of the decade by one of Korea's most popular online music websites, MelOn.

[15] SM Entertainment stated that over 100,000 copies of the mini-album were shipped to stores while sales analyst company Hanteo reported sales in excess of 30,000 copies within the first 10 days of its release.