The Killing Vote S01 E12 Happiness

"Would you join the vote?"

The majority votes to abstain from executing Seok-joo, and his Killing Vote is canceled. As Seok-joo is about to hand over the voting program, Chul-min tackles him, and they both fall deep under water. Meanwhile, someone holds a Gaetal mask in their hand, and they put it on. Who could it be?