On Go Go Waikiki, Joon Ki (Lee Yi Kyung) helps out Seo Jin with a little help from Crab Man and goes on to unmask(ha) the King Of Masked Singer, the Blushing Octopus.
And voila! We’re in cameo territory.
Kang Kyun Sung, the singer, makes a don’t-blink-or-you’ll-miss-it appearance. He must’ve had fun, too, he even showed some love on his Instagram.