Undifferentiated, SSSS-Ranked

Blurb: Three years ago, someone with an SSSS-level attribute appeared in the ABO database. It was the first 4S to emerge in the hundred years since the Empire's liberation. The strange thing was... this person's gender was unknown. In other words, this 4S could be considered an Alpha, a Beta, or even an Omega. The executives of the ABO Bureau fell into deep thought over what kind of partner they should arrange for him in a genetic match, in hopes of creating a second 4S in a hundred years. The Alliance's most elite First Legion had an Alpha demon king named Xu Yanchi. His genetic attributes were unknown, but his leadership and combat abilities were both SSSS-level. No one in the entire Alliance could beat him, and there was no mission he couldn't complete. In the second year after the demon king was promoted to captain, he met a new recruit. The boy had just turned seventeen. He was fair-skinned and delicate-looking, but his eyes and brows held a world-weary look. With his rebellious streak, he was as untamable as a wild beast. His name was An Yulie. By chance, the boy got on the demon king's bad side. Three years passed. The world-weary boy became a young man, still as rebellious as ever, and even more defiant than before. One night, he pinned the demon king against a wall and addressed him respectfully, but said without a shred of respect, "Want to have a little fun with me?"... Very well. The demon king lowered his eyes to regard the young man who didn't know what was good for him. His fingers curled slightly, and the part of him that wanted to teach someone a lesson stirred. Fine. Then let's "have a little fun." But he would decide how. --A few things to know-- ① ABO world setting ② A power couple ③ Xu Yanchi x An Yulie. Revealing the pairing now so no one picks the wrong side, haha. ④ I'm terrible at writing blurbs, so please give the first three chapters a chance. Thank you~ [Updates every night at midnight] There are related novels to this one in my author page. Click through if you're interested → "After Transmigrating into a Beta, I Got Involved with an Alpha" AB romance, pairing: Huo Juan x Pei Yule [Complete] "Double Alpha" AA romance, pairing: Bian Chuan x Xu Yanxi [Complete] "I Differentiated into an Omega While Dreaming of Becoming a Mighty Alpha" AO romance, pairing: Shen Pin x Fei Yisa [Coming soon to my author page, please add it to your collection~] New upcoming novel ①: "The Heartbreaker's Guide to Turning the Tables" At the age of twenty-four, Jian Mingbai was diagnosed with a terminal illness. He had only three months left to live. The first thing he thought of wasn't how to spend his savings, or how to live out his final few months and make them as wild and wonderful as possible-- It was that after being Shi Lian's devoted admirer for so many years, he still hadn't managed to sleep with him. He added it to his list of things to do before he died. He was going to turn the tables and break the heart of the man who had ignored him throughout all four years of college. After two months of trying, Jian Mingbai succeeded. Then he sat on the bed, holding his nearly broken-in-two lower back, and contemplated life. Being a devoted admirer was hard on his pride, while being a heartbreaker was hard on his body. He had only a month left to live. It was time to enjoy his final days and make peace with the world. Besides, a successful heartbreaker knew to take what he wanted and run. But while he could be the one to start things, he wasn't the one who got to end them. Shi Lian wouldn't allow it. He went mad. He cornered Jian Mingbai with his medical test results in hand, refusing to let him off the hook even for his last month. Jian Mingbai swallowed, thinking of his own fragile lower back. How was he supposed to tell him... that it was all just a misunderstanding? New upcoming novel ②: "After Being Abandoned, the Loyal Dog Turns into a Mad Dog". I'm gathering interest for now. Blurb coming soon. Probably a different take on an old flame rekindled. Theme: Take control of your own fate