Yoon Hyun Sang takes us on the recording scene of 'When Would It Be' with IU

Yoon Hyun Sang releases the recording sketch of his duet with IU 'When Would It Be'.

In the clip, the two started off by creating a friendly atmosphere at the studio and both shared interesting facts. They also get help from Kim Je Hwi who assisted them throughout the recording.

Watch their live singing below: