Tokushu Shufu ~Sekai Saikyou desuga, Danna-sama ni Mamorarete Masu~NewSpecial Housewife; 特殊主婦～世界最強ですが、旦那様に守られてます～

https://mechacomic.jp/books/265800 My husband thinks I’m a “fragile wife who needs to be protected.” —But the truth is, I’m a former mercenary who was once the strongest in the world. Sakurai Misaki fell in love at first sight with her salaryman husband and, while keeping her past a secret, settled into the life of an ordinary housewife. Her days were peaceful, surrounded by her kind husband and son… until she is suddenly asked to go undercover and investigate a child abduction case. What awaits her are feuds among the wealthy elite, conflicts with other mothers, infidelity, and an ever-deepening web of messy relationships. Even so, there is one person who absolutely must never find out the truth—her husband! An unprecedented high-rise apartment × romance × comedy!