The Smart Rock Man Tells You What to Do!

Synopsis: A destitute university graduate who studied hard despite his poverty transmigrates into another world as a stone monster. He inherits its indestructible body, takes over its brain, and gains unparalleled strength. He had planned to grow stronger before throwing punches at Eagle Nation and trampling Sakura Island. But then he saw an official post fishing for information, and Qin Fugui promptly decided to come clean and join the organization. He keeps a low profile and builds up his strength within the organization. Only when cities across the country are the first to merge with another world does everyone discover that plants from that world have already sprouted in the remote little city where Qin Fugui lives. So just how many powerful experts do you people have?

(The protagonist is in poor health and can't have a female lead. His only goals are the stars and the sea, and the irresistible allure of martial power.)