Left Handed Mutation is a Manga/Manhwa/Manhua in english language, REINCARNATION 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

Human genes mutate, those with extraordinary genes may gain superpowers, and those with monster genes may mutate into monsters. Xingcun, who became a monster, was awakened and later reborn after the sacrifice of the heroine. In this life, the prodigal son shall use the mutation to fight back and protect the heroine. While he may lay hidden among the supermen, and he shall secretly use his mutation to hunt monsters, seize the power of the ancient demon god, and prevent his resurrection.