On Infinite Challenge, Park Myung-soo is being "the second-in-command" (2인자), putting him below the host-in-chief Yoo Jae-suk, that called as "the first-in-command" (1인자). He is the oldest among another Infinite Challenge members.Park Myung-soo has hot-tempered character. Myung-soo's jokes about how he will overthrow Yoo Jae-suk as leader and being "the first-in-command" himself was the early running gag on the program.