Monsta X is filming something new!

The massively popular South Korean boy band was spotted filming a music video on Monday (September 23) in San Pedro, Calif.

PHOTOS: Check out the latest pics of Monsta X

The members of the boy band were seen filming a pier scene, followed by a rain scene which involved some special effects, including lighting and smoke.

The group became the first male K-pop group to perform at a major music festival in the United States on the Fremont Stage of Life Is Beautiful in Las Vegas on Saturday (September 21).

READ MORE: Get To Know K-Pop Boy Band Monsta X With These Fun Facts! (Exclusive)