I Have A Set of Passive Skills is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

“Is the strongest skill in the world a skill that needs to be actively used?” “Wrong! It’s a passive skill!” “What is a passive skill?” “A passive skill is an instant-activated active skill, a killing move that no one will be prepared for, the ultimate trump card that only the dead can know!” “Can you explain it in simpler terms?” “Breathing techniques, strength, perception…” “Heh, is that it?”