The Serpent's Sanctuary of Invasion

In order to restore order to the world, the snake and the turtle must become one, fulfilling their duty as the Black Tortoise. In a world overrun with demons and monsters, Saehyun and Youngmu strive to awaken as the Black Tortoise. To awaken, Saehyun proposes sex to Youngmu, but is met only with disgust. "How can we have sex, between men? How disgusting. We'll take care of it ourselves, so please stop." Saehyun leaves Youngmu, the object of his unrequited love, and resolves to awaken on his own. Eight years later, Youngmu and Saehyun reunite as adults... "You told me back then to just let you do it, as it was the fastest way to become the Black Tortoise. Can't you do it now?" Youngmu ...