NamgungSe is a Small Craftsman

After suppressing the rebellion and putting in order another world, Namgun So Hwi returned to the world of Mu Rim. He walks through the world while hiding his strength that will shake the world of Mu Rim.

Original Webtoon:
Daum, KakaoPage

Note: The title can also be NamGoongSaeGa is a Little Fauntleroy as 소공자 directly translates to Little Fauntleroy (a young manner boy)