The second track and joint lead single from Red Velvet’s debut EP, Ice Cream Cake, the song marks the group’s first release since becoming a five-member group, with the introduction of Yeri. With an old-school R&B vibe, the track acts as a direct sequel to their previous single “Be Natural” as the lyrics, written by Choi So Young, entail the whirlwind of emotions the girls experience as they feel naturally and automatically drawn to a guy.

“Automatic” received acclaim from music critics for its throwback sound and 90’s influence, with Seoulbeats praising the “soulfully mature vocals that are reflected in the eerie chorus” as well as Allkpop also praising the vocals calling them “very polished” and “extremely soothing”. Leader of Red Velvet, Irene, told K-popped! that the track was intended to showcase all of the members' strong vocals.

The song proved to be a moderate success, debuting in the top ten on four Korean music sites and reaching over 50,000 downloads in its first week. “Automatic” also peaked at number nine on the Billboard World Digital Songs Chart and the music video became the sixth most viewed K-pop video worldwide for month of March 2015.

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