A's Doll House is the second extended play by South Korean singer Ailee. It was released on July 12, 2013, by YMC Entertainment and Neowiz Internet. The song "U&I" was used to promote the EP.

On July 12, 2013, Ailee released the album, A's Doll House, as well as the music video for "U&I".

The Japanese version of the song U&I is also the second single by Ailee in Japan, which was released on March 19, 2014.

Promotions for the album started on July 12, in KBS's Music Bank. Ailee also promoted on Mnet's M! Countdown, MBC's Music Core and Show Champion, and SBS's Inkigayo in July. The single "No No No" was chosen to be part of her comeback with the second single "Rainy Day". On July 24 Ailee won her very first music show award on MBC Show Champion for "U&I". Ailee also won 2 Music Bank awards.

"U&I" was number one on Gaon Single Chart. "U&I" achieved its highest debut on the K-Pop Hot 100, where it debuted at number one for two weeks. "Rainy Day" peaked at number 31 on the Korea K-Pop Hot 100 the week of September 4, 2013. "NoNoNo" peaked at number 21 on the Korea K-Pop Hot 100 the week of September 24, 2013.

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