“Since you act so naive and clueless, I can’t help but wonder if you even have a cock, Brother.”

The arrogant younger, Yeon, always looked down on his elder brother, Kang-woo—calling him a blockhead, or even an animal. But as an adopted son, Kang-woo only ever answered such insults with a faint, scholarly smile, quietly enduring Yeon’s mockery. Until one day—

“You’re always treating me like some beast… or a eunuch. Aren’t you curious how that ‘beast’ behaves at night?”
“...”
“I’ll show you my cock.”

This time, Kang-woo finally begins to react to Yeon’s usual provocations.

Original Novel
Original Webtoon