Baek XX 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

BaekXX Park Taejun Manhwa Company, Sergeant / Punchkick (HID) Federal Informant ‘Baek Yisu’ and a criminal gang’s boss, ‘Baek Dogyeong’ are twin brothers. With the same faces the two twin brothers have lived different lives until now. Yisu, who’s been betrayed by the gang, throws away his identity to become his brother. This federal agent is soon to become the gang’s boss…!