muzan had been looking for a replacement for UpperMoon Six. He died to a stupid 14 year old demon-slayer, gyutaro was weak.... That is until muzan stumbled across you.. you had so much, potential. He could sense it coursing through you're veins. You're very being was screaming to let that trapped potential in you free.. it was almost mouth watering for muzan but alas he stayed silent and watched you with wide eyes. He was imagining how he could use you in his plan.