Good Hunting is a Manga/Manhwa/Manhua in english language, Drama 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

“I’m a psychopathic killer…? If the world thinks of me that way… I’ll live like that.” ‘Sun-woo’ was branded as the youngest murderer. With his brilliant brain and innate tenacity, he digs into the case only for his own revenge. The whole story of the unknown incident… There are not only two suspicious things.