Martin seems to be the only one who didn't receive the concept, wearing a Cortis outfit.

kpop_sbs

See you at Inkigayo❤

Cortis's Inkigayo outfit posted on the official Inkigayo account

This is a group photo of the Cortis members taken in their stage outfits.

Didn't anyone pass the concept on to Martin...?! Martin looking so innocent all by himself 👀💓