On September 18, JYP Entertainment opened behind-the-scenes cuts for Stray Kids, who made a comeback with their new song "'IN生'" and title track "Back Door" on September 14, and conveyed the amicable atmosphere of the scene.

The in-team production group 3RACHA, composed of BANG CHAN, CHANGBIN and HAN, smiled broadly at the camera and gave off bright energy.

HYUNJIN and I.N. drew V with a smile around their mouth, making the viewers happy.

LEE KNOW and FELIX wore crowns and showed off their princely beauty, while SEUNGMIN showed a chic look that fell like a black hole.