The song was commercially successful, peaking at number two on the Gaon Digital Chart and selling over one million downloads in South Korea in 2010.

[6] The lyrics compare a two-faced lover to the devil,[1] and contain lines such as "Her whisper is the Lucifer"[6] and the "militaristic" refrain of "loverholic, robotronic".

[7] Shinee were originally scheduled to hold their first performance of the song on Music Bank on July 16; however, it was postponed by a week due to a leg injury Minho sustained while filming the variety show Let's Go!

Writing for GQ, Taylor Glasby called it a "classic single", and highlighted the lack of vocal processing that was a feature of many K-pop songs at the time.

[14] On the other hand, IZM's Lee Jong-min was critical of the departure from Shinee's fresh sound, previously found in songs like "Replay", and felt that it veered too close to the typical SM boy group style.

[15] Tamar Herman of Billboard praised the song's "forceful charisma", describing it as a "game-changing tune" that is one of Shinee's "most dynamic pieces".

[2][6] Spin named it one of the greatest K-pop songs of all time, with staff writer David Bevan calling it "a total romp".