THE RAIDER is a Manga/Manhwa/Manhua in english language, Manhwa 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

In a world where humans and monsters are indistinguishable, the "True Raider" emerges! After the appearance of monsters that tear humans apart, society has divided into two parts, "Raiders" and "Non-Raiders."

24-year-old Lee Semin, unable to become a Raider no matter how hard he tries, confines himself to a small room. One day, he stumbles upon a strange website.

｢ Welcome, new member.
To Transcendental Network.
A community connecting transcendent beings across dimensions.｣

They reveal to him the true world of martial prowess. Amidst the chaos where humans and monsters are indistinguishable, the "True Raider" is about to make their entrance!

“Bring it on, you bastards.”