Phantom Spirit King 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

In a world where the Murim world of the past continued on to modern day… After the killer ‘Phantom Spirit King’ disappeared without a trace, the Murim spent its days peacefully. One day, a drug that enhances the inner strength of Martial Artists appeared, and just in time, the ‘Phantom Spirit King’ who had disappeared showed himself. Then, the Murim that was peaceful plunged into the vortex of chaos once again..