Angel's Knock is the debut Korean language studio album (third overall) recorded by South Korean girl group AOA. It was released on January 2, 2017 by FNC Entertainment and distributed by LOEN Entertainment through digital and physical platforms.

Double title tracks, "Excuse Me" and "Bing Bing," which represent two distinctive concepts, were released and promoted simultaneously on the music programs during their comeback week. Korean versions of AOA's previous Japanese singles, "Give Me the Love" and "Oh Boy," are also included at track 8 and 9 respectively. "Excuse Me" charted at number 22 on the Gaon Digital Chart, while "Bing Bing" debuted and peaked at number 45. The album marked the group's first comeback after the departure of member Youkyung in October 2016, and their worst performing comeback since Confused.

The album was a commercial success peaking at number 3 on the Gaon Album Chart. It has sold 33,655 physical copies as of February 2017.

On November 29, 2016, FNC Entertainment first stated that AOA were in the preparation stages with the goal of releasing their debut Korean studio album, which came four-and-an-half years after the group's debut back in July 2012. The group's leader, Shin Jimin, also shared on the official blog that the album will include a song for Elvis, which is the name of the group's fanclub.

On December 21, FNC Entertainment revealed the promotion plan poster for AOA's comeback and promised the album will "show every aspect of AOA’s musical skills accumulated in the past four years." The poster first teases "Another Me" for December 26, "AOA vs. AOA #1" for December 27, "AOA vs. AOA #2" for December 28, "Secret Room" for December 29, and "Magic of Umbrella" for December 30, while the full album, titled Angel's Knock, and promotional music videos will be both released on January 2, 2017. These teasers were revealed on a special web page designed for the group.

On December 23, AOA member, Kim Seol-hyun, posted two teasers on her Instagram account with hashtag #AngelsKnock and #20170102. The caption says "D-10 Another Me Teaser." The short videos are showing Seolhyun in two different styling. The first one is of her wearing a white blouse with minimalist makeup and wavy hair; she's also staring at the camera innocently. The second teaser is of her wearing black blazer, hair slicked back and she's fiercely challenging the camera.

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