
I'm trying to find any manga or manhwa similar to this one. I hope you guys can reccommend me soemthing (๑•ㅂ•)و✧

I would say Nobunaga no Chef and Jin are quite similar. They feature characters with specific knowledge and skills thrown back in time who utilise that knowledge to thrive.
Nobunaga no Chef is about a modern-day chef who wakes up in 16th century Japan and his cooking skills catch the eye of a powerful warlord : https://www.mangago.zone/read-manga/nobunaga_no_chef/
Jin is about a neurosurgeon transported to the Edo period who opens a clinic and uses his modern medical knowledge to save people : https://www.mangago.zone/read-manga/jin/
Another would be The Apothecary Diaries. However, there is no time-travel. I recommend it more because it features a smart female lead who utilises her knowledge of herbs to solve the mysteries of the imperial palace after being sold as a servant : https://www.mangago.zone/read-manga/kusuriya_no_hitorigoto/
I...never envisioned mueller so...childlike? (⊙…⊙ ). I imagined he was more of a dwarf like height but is old. He is like older than the kids right? ( ̄∇ ̄")
He’s like 40 or something
Isn't he something like a teen in dwarf age ?