Iron-Blooded Soldier King's Smoke Lock Jishi Pot

He is a sharp sword in China, but he lost his loved one because of one mission; from then on, he turned into a killer. Five years later, when he became the top of the killer list, he was still lonely in his heart. He wanted to hide away, but unexpectedly met a young CEO of a pharmaceutical company who was in trouble... (There is no harem or immortality in this article.)