Reborn As A Sovereign in Disguised!

WPC#330 contest. Weak to strong X, that's what he's called during the mission. The man who has become an assassin in Russia suddenly gets an unexpected attack and dies in a clichéd manner until his soul occupies the body of a poor man who only lives with his mother-in-law. Dominic Louzen is a poor son-in-law who is not even loved by his wife. Unfortunately, X occupies Louzen's body without getting any memories from the owner of the body like in the manga or novel he reads. "Unlucky! How can I occupy the body of a poor son-in-law like him?” Not only that, living with a fussy and demanding mother-in-law, makes X choose to leave and leave his wife without a word. By relying on his killing skills to get money, X also meets one of the organizations that bring him to reality. “I, your leader?!” So, how does X who occupies a new body begin his life journey to become the identity of Louzen?