My Ex-Girlfriend is the Strongest Guild Master and I'm the Weakest! - The Tandem & Users Classifications

This is a story of a man named Kim Sae-Jin, who one day, inexplicably wakes up as a Monster. Follow him and his perilous journey to get his life back as a Human, all the while growing even more versatile as a Monster in the process. This should be… complicated, somewhat.

The Apocalypse is in full swing. Defiled - powerful creatures corrupted by the Great Collision - prowled the lands in search of prey. Unfortunately for them, the human race had long since retreated behind the secure walls of the Sanctuary of Everlast. During one of his regular excursions outside the Sanctuary, Alden is separated from Celeste. - his childhood friend and crush. In that moment, he came to regret never summoning the courage to confess. Somehow managing to survive thanks to some trickery, Alden awakens as a mage. Instead of receiving a normal power, he gains the ability to decay. What’s more, during his ascension, he received a vision from his future self advising him not to trust the Asterons - celestial beings who had saved his race from inescapable doom. Normally... such a revelation wouldn’t faze Alden. However, there was only one major problem with the declaration, though. Celeste was bound with an Asteron. And not just any normal Asteron... She had made a pact with one of the Divine Sovereigns.

A former police officer dies and is longing for a quiet and peaceful life away from the chaos. Reborn in a new world, he must navigate strange lands, unexpected challenges, and a chance at the slow life he always dreamed of, if he can survive long enough to enjoy it.

【 Warning: Mature Content R-18 】“To rule the world, he wanted to be a King. Fate decided he would be a Queen.”*Slow-Burn TF: A detailed transformation from a lean boy to a voluptuous, devastatingly sexy beauty.*Genre: Gender Bender (Male to Female), High Fantasy, Adult, System, Harem, Incest (Cousins), R-18, Mature, Yuri (After Transformation), Domination/Submission.Alex was a disappointment. In a world ruled by powerful Gene Warriors, he was a nineteen-year-old F-rank awakener with zero talent, working the bellows in his uncle's blacksmith shop.As a fellow traveler from Earth, he dreamed of a powerful system, strength, domination, and standing at the top. But a thunderstorm in the Green Leaf Mountains changed everything.Seeking shelter in a dilapidated shrine, Alex stumbles upon a broken statue and a mysterious, silver-haired beauty who shouldn't exist.She is the Silver Serpent Empress—an ancient, predatory soul in need of a body. And she chooses him.Locked in a battle for his own body, Alex watches in horror as his rough skin molts away to reveal porcelain perfection, his muscles soften into dangerous curves, and his presence becomes a pheromone-laced trap that no one—male or female—can resist.“Stop fighting it, little vessel,” the Empress whispers in his mind, her voice like honey mixed with poison. “Look at how your cousin looks at you. The City Lord wants to chain you to her bed. You have the power to bring kingdoms to their knees... all you have to do is open your legs.”Alex trembled, clutching his chest where his nipples were throbbing painfully against his shirt. “I am a man! I won't be your toy!”“Are you?” she laughs. “Then why does your body tremble so sweetly when you are touched?”Alex must navigate a world where he is no longer the hunter, but the ultimate prize.