I am desperatly looking for manga/manhwas/manwa where time travel has the main protagonist, from modern times (20/21e century), travel back to the past.
The time travel can be an action from the hero (meaning he wanted to time travel) or it can be an accident (the hero did not expect it).
So far, these are the mangas I am reading :
Jin:
I love it. It's about a surgeon from Tokyo who travels back by accident to Edo Japan where he decide to do his best to fight the biggest pandemics by using his knowledge.
This manga is the reason I am looking for other like it.
Manga is currently completed, but the scanlator are far too behind and slow (I am not criticizing, they do awesome work!!).
Nobunaga no Chef:
Great and enjoyable. It's about a chef who travels back to Sengoku Era for unknown reasons. He lost his memory but not his skills: he's a master chief. He ends up serving Oda Nobunaga. It's very enthralling and the hero is awesome.
Manga is still in progress, but the scanlator is also far behind and slow (again, not criticizing '^^).
Zipang:
Great as well ! It's about a cutting-edge cruiser / destroyer from 21th century. In the mission in the Pacific Ocean, a strom transports the ship back to 1942 in the middle of a battle between the Empire and Alliance. This is an awesome manga and the plot is serious and enthralling.
The manga is completed and again, a slow and late scanlator ! ^^ (I'm not lucky ... :/ )
Thermae Romae:
I watched the live movie. Was fun ! But it's the other way around: protagonist goes into the future (our present) to improve his time (the past).
and finally Sengoku Strays:
Did not start it. Seems nice and interesting too. Looking forward, but very short: 15 volumes.
As you can see all of them, except Thermae, falls into my specifications.
I hope there are other with the same caliber.
The material can be japanese, corean or chinese

Thank you all in advance !!