Twin Detective 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

Sun Xiaohu and Sun Xiaotu were twin brothers. Xiaohu died by accident in his college but nobody knew the cause of his death. It’s strange that his younger brother Xiaotu could always see his soul. Later on, they opened a firm specializing in dealing with supernatural events. The story starts with a high school girl’s encounter of ghosts…