Crush & Seventeen's Hoshi hint at their collaboration project

On October 21, Seventeen's Hoshi appeared as a guest on Crush's YouTube channel, 'BLACKVOX'!

On this day, Hoshi cutely revealed, "When I received your request, I felt like I'd made it."

The two musicians then went about exchanging compliments toward each other's music, as Hoshi showed his love for Crush's "Rush Hour" and Crush expressed admiration for Hoshi's "Spider" stage. 

Next, Crush and Hoshi revealed that they are working on a collaboration project! Hoshi stated, "I've always wanted to produce something for another musician," to which Crush commented, "I am so eager. I have so much desire to try different things as a singer. I want to discover a new me." 

Finally, bidding viewers farewell, Hoshi said, "Because of our world tour, we are on bit of a hiatus from promotions in Korea, but thanks to Crush hyung, I was able to greet you all like this. I'm looking forward to doing some great work [with Crush]."

What do you think Crush and Hoshi are working on?