I Became an Uchiha's Live-In Son-in-Law from the Start

Update: The An Chigong counterpart story, I Heard I Kidnapped the Ninja World. Protagonist is the pursuer, pairing with Izuna. [Synopsis] In a word: a story about an overly affectionate couple. [An Chigong's side] An Chigong, the former number-one rebel in the post-apocalyptic world, is now a scheming merchant in the Warring States era of the ninja world. To buy up businesses across the entire world, he decides to hire the strongest ninja clan as bodyguards. But the two strongest clans are locked in a fight to the death, and he has no idea which to choose. Until he seizes the perfect opportunity that lands right in his lap. The second-in-command of one fan-wielding clan has been killed by the other clan, and the head of the fan-wielding clan seems to have gotten the wrong idea! Madara: I know you two are lovers. I'll take you to see him one last time. An Chigong: ...Let me marry into your family! Madara: = =??? Good news: Marry into the clan and get a whole clan of bodyguards for free. What a bargain! Bad news: You'll be a widower from the moment you marry in. Good news: I can handle that! Bad news: ...He came back to life halfway through! SOS: He really came back to life! Izuna: (coldly) You? My lover? An Chigong: ... (I'm so screwed!!!) Q: What happened after that? A: I married in, and grew another hopelessly romantic brain. Q: What about your partner? A: He's got 24+1K pure, unadulterated career ambition for brains! He's the archetypal unromantic arsonist who flirts but never puts out the fire! Q: So what are you going to do? A: No problem. I'll just grow another career-focused brain. [Izuna's side] Izuna: He's mine. He can only be mine. Q: And then? A: ...My spell got interrupted. Q: So? A: ...It was pretty good, but I need to build up my stamina. Q: What did you do to him? This guy came from an infinite world! A: (looks away) ...It's his fault for being so dazzling. * Uchiha An Chigong, a famous hopeless romantic in the Uchiha clan. Life motto: No one can resist an Uchiha! No one! How the clan sees him: A dazzling peacock. How others see him: A gorgeous, talented guy who's a bit of a mess. In short: Uchiha An Chigong is a wonder who somehow turned a forced-marriage story into a sweet romance. PS: 1. The protagonist is the pursuer, and Izuna is the love interest. A sunny, flirtatious, younger golden-haired beauty with a political brain, who cries easily, is the pursuer x a dark-haired beauty with a high attack and low defense who loves to flirt (a beautiful couple). 2. They fall for each other mutually. No Hashirama x Madara. Madara is strictly a devoted little brother, and is attracted to strength. Sasuke x Naruto is not specified either way (not switching; no romance plot for the side couples). 3. They can really fight when they get serious~ No Konoha founded by the two clans together. [This story will be released as a paid novel on March 19, 2025. There will be a 10,000-word update that day. Please support the official release, mwah~~] Theme: Striving for your ideals is the best gift you can give yourself.