Ailee will work with Wheesung for her upcoming comeback.

On December 30th, YMC Entertainment said Ailee will released a song named "Improved Song" which is produced by Wheesung on January 6th.

"Improved Song" is a rock ballad which will fully showcase Ailee's powerful and soulful voice. The song is produced and penned by Wheesung, composed by Moon Ha.

Ailee's debut song "Heaven" was also produced by Wheesung and it received much love from music fans. After one year they finally work with each other again, many fans are really excited and anticipating for Ailee's comeback this time.

It's also revealed that Ailee will reveal teaser on January 4th on Youtube. Stay tuned!