SSS Grade Saint Knight 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

The game descended on reality, monsters run rampant, magical disasters overflow, everyone needs to choose a class and level up to become stronger. Zhou Yi who has been unremarkable until now awakened the S+ rank talent Protection of the Sacred Angel on the day of class awakening, turning his class into the hidden class Sacred Knight! Weapon blessing, angel blessing, honor blessing… With all sorts of buffs, Zhou Yi destroyed the space itself with just his aura. Who was it that said sacred knight is just a mundane class?