@Ahiddict[Ahin] Oh, hahahah, I don't remember everything since it has been some time since I finished reading it, but
Spoiler!
He is actually a doll summoned through black magic (which is strictly prohibited) by an ambitious noble and returns to his own world after a lot of trouble. Our protagonist miss the ml a lot after returning. The duke goes after him in Korea and appears in the body of a mini doll to get him back. After this is happy ending 😃.