Latte

I googled this dude since I never read the manhwa he's from, but these stories feature armoured characters that might resemble him a bit:

https://www.mangago.zone/read-manga/goblin_slayer/ (shounen manga; the MC is armoured; violence, gore, depictions of sexual assault)
https://www.mangago.zone/read-manga/fullmetal_alchemist/ (shounen manga; secondary protagonist is armoured violence)
https://www.mangago.zone/read-manga/berserk/ (shounen manga; the MC is armoured and a later side character - Skull Knight; gore, violence, depictions of sexual assault, child sexual assault, child abuse)
https://www.mangago.zone/read-manga/the_noble_lady_on_the_edge_of_the_cliff_wants_to_make_the_dark_knight_fall_in_love/ (GL manga; the FL is armoured; mild violence)

Sorry if they're not quite what you're looking for.

https://www.mangago.zone/read-manga/will_you_marry_me_again_if_you_are_reborn/
https://www.mangago.zone/read-manga/timeless_melody/
https://www.mangago.zone/read-manga/life_senjou_no_bokura/
https://www.mangago.zone/read-manga/homeless/
https://www.mangago.zone/read-manga/for_the_sake_of_sita/
https://www.mangago.zone/read-manga/the_story_of_the_kiwi_bird/

https://www.mangago.zone/read-manga/my_wife_whom_i_loved_dearly/uu/to_chapter-oneshot/pg-1/

This might be the only manga that ACTUALLY made me ugly cry, not just tear up: https://www.mangago.zone/read-manga/haruka_tooki_ie/

Girl I said wholesome, this masterpiece is not wholesome I already read this and it made me cry for 3 days

Oh I misunderstood AHAHAHAHAHAH
I almost emotionally damaged an innocent victim (but I see that it already emotionally damaged you, we're good)