Vanta Black 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

"You've disturbed something that should have been left alone."Lee Shin-hyuk, codenamed "Ventablack," is the Korean leader of "55" - an elite special operations unit selected from the world's top black agents. One day, his younger sister Sumin, who dreamed of becoming a K-pop idol trainee, is murdered in South America... and the world tries to cover up this fact.After abandoning everything to investigate his sister's death, Shin-hyuk confirms that the international drug cartel "XICA" is likely behind it. Subsequently, for his revenge, he deliberately approaches his targets by becoming a bodyguard for "Yoo Chae-won," a global K-pop star whom they were originally targeting.Finally, he plunges into Brazil's "Favela" - a land of death forsaken even by God...