"Heaven" is the debut digital single by Ailee. It was released on September 2, 2012.
"Singing Got Better" (노래가 늘었어) is the second digital single by Ailee. It was released on January 6, 2014.
"Johnny" (쟈니) is the third digital single by Ailee. It was released on June 30, 2015.
"Q&A" is a collaboration single by SEVENTEEN (featuring members S.Coups, Vernon and Woozi) and Ailee. It was released on December 4, 2015.
"Reminiscing" (낡은 그리움) is the fifth digital single by Ailee. It was released on February 27, 2017.
Thirst (갈증) is the collaboration single by Mad Clown and Ailee. It was released on May 14, 2018.
"What About You" (묻지마) is a collaborative digital single by Ravi and Ailee. It was released on April 28, 2020.
"Me Me We" (나 너 우리; stylized in all caps) is a collaboration single by Ailee, Ravi, and Newkidd. It was released on July 30, 2020 and features Aizat Amdan, Chillies, PAAM, Quest, and Rahmania Astrini.
The single is a global collaboration project to bring comfort from those suffering from the COVID-19 pandemic. It features 8 artists involved in 6 different countries in Asia: South Korea, Indonesia, Malaysia, Vietnam, Thailand, and the Philippines.