My Childhood Sweetheart Is an S-Class Ceiling

(Pure love, mutual redemption, single female protagonist) Lin Yuan thought that the greatest luck and misfortune in his life were both the same girl. Fortunately, he has a childhood sweetheart named Su Wanqing - the youngest S-class superpower in the history of the Federation, codenamed "Blazing Phoenix", who stands at the pinnacle of human power. Unfortunately, he has been a "talentless person" for eighteen years, living in a dilapidated small building in the slums, going to school during the day and working at night, and can't even touch the lowest level of F-level abilities. The whole world said that Su Wanqing's care for him was nothing more than the pity of a strong man for his childhood playmate. Until that day, the tide of alien beasts broke through Jiangcheng's defense line, and the slum where he lived became a purgatory. When everyone was in despair, red flames tore through the night. She descended from the nine heavens and tore the Beast King to pieces with her bare hands. In the smoke, she turned to look at him, her fingertips brushed the blood on his cheek, her eyes were as gentle as the girl with braids ten years ago: "Don't be afraid, I'm coming." At that moment, Lin Yuan realized that Su Wanqing had never been protecting this city. She only protects him. Later he learned that on that rainy night ten years ago, she integrated half of the "Fire of Nirvana" origin into his blood. From that day on, her strength was to protect his ordinaryness, and her glory was to cover up his specialness. And when the truth is revealed! The sleeping origin in his body finally awakened, and the abyss intertwined with the flames. The young man stood up from the ruins and looked at the girl who was the enemy of the world for him: "This time, let me protect you."