IU has released a comeback song "Night Letter" teaser

Singer IU has released a comeback song "Night Letter" teaser.

March 20 , IU has released two photos of the "NIGHT LETTER" teaser picture of the premiere song released on April 24 through her Instagram .

In the teaser, IU staring at her somewhat aloof and lyrical. Emotional lyrics such as 'How did I come to you?' And 'If we are together now, how good would you be?'

After releasing two pre-release track on March 24 and April 7, IU will release its fourth regular album on April 21 .