this is kind of late but i just read ch37.5 and... i'm proud of myself (lol) to realize the manhwa indeed inspired by Full metal alchemist (▰˘◡˘▰) http://www.mangago.zone/home/mangatopic/2477514/
Prolly how the main character has blond hair and yellow eyes exactly like the Eldrich bros did? He could be a close cousin, or grandpa, considering the timeline.
this is kind of late but i just read ch37.5 and... i'm proud of myself (lol) to realize the manhwa indeed inspired by Full metal alchemist (▰˘◡˘▰)
http://www.mangago.zone/home/mangatopic/2477514/