https://www.mangago.zone/read-manga/mashle_magic_and_muscles/
https://www.mangago.zone/read-manga/dungeon_reset/
https://www.mangago.zone/read-manga/omniscient_reader_s_viewpoint/
https://www.mangago.zone/read-manga/the_beginning_after_the_end/
https://www.mangago.zone/read-manga/sss_class_suicide_hunter/
https://www.mangago.zone/read-manga/tougen_anki/
https://www.mangago.zone/read-manga/chainsaw_man/
The recommendation at the top is good too! I have others at my want to read but I didn't read it yet so I'm not confident to recommend it to you.
Most of these are pretty famous but since you said you're new to actio manhwas, you probably have not read some of this yet.
• Ranker Who Lives A Second Time
• Study Group
• The Boxer
• The Live
• Doctor's Rebirth
• Ernak
• Omniscient Reader's Viewpoint
• Tomb Raider King
• Trapped In A Webnovel As A Good For Nothing
• Welcome To The Nightmare Game
• My Dad Is Too Strong
• Gangnam Dokkaebi
• Kill The Hero
• I'm An Evil God
• SSS - Class Suicide Huntef
• White Throne Of Bones
• Return of the Frozen Player
• The Legendary Moonlight Sculptor
• Spare Me, Great Lord!
• Global Martial Arts
The first action manhwa I came across was Solo Leveling up until that point I’ve only been exposed to the romance side of manhwas. Needless to say, I fell in love, and became aware of similar manhwas. Since then I’ve read, The Beginning After the End, Trash of the Counts Family and Jujutsu Kaisen. I’m a big fan of the intelligent, introspective advantaged main character being thrust into a world or scenario where they are advantaged by - I don’t know something about it is satisfying to me. Anyways I’m here to ask for help finding more manhwas or stories similar to this very specific trope since they are all I can focus on now