Prior to the official release on March 21, IU has just unveiled the preview for her Japanese debut single "Good Day"!

"Good Day" is a remake of her Korean hit song which topped music charts for 5 consecutive weeks. The song showcases IU's great vocals, bursting out her 3-high note. IU recently wrapped up her showcase of her Japanese debut "Japan Premium Live" on January 24, and amused fans with her boundless talent.

The single "Good Day" will be available in three versions: Regular Edition, Limited Edition A, and Limited Edition B. The ‘Regular Edition’ is a CD-only package, while the two ‘Limited Editions’ come with extra bonuses like a DVD and photo booklet.

IU's Japanese single "Good Day" will hit the shelves on March 21. In the meantime, check out the preview video below.