I also watched the music video for their debut song, "Congratulations."

Choi Woo-shik and an actress who used to be under JYP... I'm not sure if she's still with them... but anyway, actress Jang Hee-ryung appeared in the music video.

The precarious(?) chemistry between the two of them was good, too...

The members of DAY6 also appeared and showed off their powerful instrumental performance and singing.

Harmonizing..

It was an impressive music video.