A teaser video for Rain and Chungha's new collaboration song has been released.

Rain posted a teaser video of the title track "WHY DON'T WE (Feat. Chungha)" of his mini album "PIECES by RAIN" with Chungha on their official SNS on February 22nd.

In the released video, the video opens with the sound of a phone ring, and Rain and Chung-ha are shown intersectionally on various screens.

In particular, Chung-ha's colorful and impactful appearance of shooting at someone in the ringing and honking of the phone and Rain staring at the camera with no expression in black clothes in the light are drawing attention. The two are showing charisma with just one look, heralding a perfect chemistry.

Also, the groovy melody in the second half of the video captivates listeners with just a few seconds, raising expectations for the new album.