My White Moonlight Thinks I’m a Substitute, but Doesn’t Know I’m the One in Charge of the Family!

My husband's long-lost first love, missing for ten years, has returned. Tears streaming down her face, she throws herself into my husband's arms. He gently comforts her, heartbroken. She glances at me and feigns pity: “Now that I'm back, shouldn't you divorce her and make her move out?” She thinks I'm a substitute my husband found, living the life that was supposed to be hers. What she doesn't know is that our comfortable life today is all thanks to me. At her words, my husband warily pushes her away. My in-laws' faces darken. I step forward and slap my husband across the face. “Sort out your mess before you come see me.”