Steal My Fiancé? Fine, I'll Make Your Life Miserable as Your Sister-in-Law

Era setting + military marriage + marriage before love + age gap + both leads are virgins Workaholic Lin Shuangshuang was born into the 1990s and originally planned to take life easy. But with so few material comforts, she had no choice but to keep working hard. While building a fortune, she did everything she could to raise her childhood sweetheart into the only college student in the village. They agreed that she would bring a generous dowry and take wedding photos at his graduation ceremony! Reality hit her like a slap in the face. At her childhood sweetheart's graduation, the one who got engaged was her sworn enemy. Watching the scumbag and the shameless woman embrace happily in the distance, Lin Shuangshuang narrowed her eyes. So that's how you want to play it? Since you stole the childhood sweetheart I carefully raised, I'll just marry your brother and make sure he keeps you and your husband in line. But... after getting their marriage certificate, Lin Shuangshuang was stunned. Wasn't her enemy's older brother supposed to have joined the army years ago? Nobody said he was that old. He was nine years older than her! Lin Shuangshuang nearly cried. So she was a tender young sprout, throwing herself right into an old bull's mouth. After joining the army, Huo Qizhou spent his days braving wind and rain, focused on serving his country, and neglected his personal life. Then along came a young woman with a slim waist, a full bust, long legs, and a stunning, alluring face, with everything about her exactly to his taste. She showed up with a letter of introduction, saying his younger sister had picked her to be his wife, and asked him to register their marriage. Without a second thought, Huo Qizhou took her to the civil affairs office and sealed the deal. They had barely gotten their marriage certificate when he heard the young woman muttering that he was already so old. That night, he was so angry that he proved with actions whether or not he was past his prime, leaving the young woman complaining as she clutched her aching waist the next morning. “Damn, he spent nearly thirty years' worth of reserves all at once. Who could handle that?”