Heart Demon 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

Li Yunxin is a human being, but what he does is comparable to a demon. 心魔 A psychiatrist in the previous life, in this life he was reincarnated as a painter who can manipulate spells, but what he can manipulate most is the human heart. Was chased and killed by Taoism, and made friends with demons. Whether it is a human or a monster, they will eventually become Li Yunxin’s chess pieces. Even the black and white Yan Jun, who took people’s souls, had to ask him when he saw him: Where did the heart demon come from?