Super String: Isekai Kenbunroku

As the eldest son of the Polo family, Marco is striving to provide for his younger siblings. After a strange and unfortunate shipwreck, Marco finds himself in Asia, a place he was warned never to visit. Soon he realizes he is at the cusp of an unexpected journey where he will have to choose between protecting his family or saving the world.
(Source: WEBTOONS)
Note: There's a simul-publishing webtoon version of the manga in collaboration with YLAB.