https://www.webtoons.com/en/challenge/unbreakable-iron-ranger/list?title_no=279422
Also, If you got a min to spare, check out this ongoing series by Deputy Rust. A nice, original series filled with cool characters from all over the place (Literally)
Rust also has a Twitter, YouTube and Discord so be sure to check those out if you find UIR to be your liking!