EXID members Hani (Ahn Hee Yeon) and Heo Solji have made their comeback as a duet.

On Thursday, March 3, the music video for their single titled "Only One" was uploaded on EXID's official YouTube channel.

"Only One" is a mid-tempo ballad with a piano melody about a woman who misses her boyfriend. The song was composed by Shinsadong Tiger and SleepWell, and its lyrics were written by EXID rapper LE.

Many fans who viewed the music video reacted strongly.

"Ahh Hani's voice," wrote YouTube viewer Mary Jung in the comment's section of the video. "Even though I don't understand what they are saying, I cried a lot. Oh my, why my heart is broken? This is so sad."

Hani and Solji's debut as sub-unit was in February 2013 with release of "Goodbye."