Machine Era is a Manga/Manhwa/Manhua in (English/Raw) language, Webtoon 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

Young-yi, a high school goalkeeper promising to lose his arm in a car accident, participates in a clinical trial of SC Bio and receives a medical transplant. Then one day the virus called "mechanism" spreads in the world, and unknown beings begin to chase the spirit. In a moment of crisis, a mysterious woman saves him and eternally tells her the truth of all these moments...