Silas would be lying if he said he wasn't surprised. Though he had been told by the system that his body was in a very peculiar situation, he thought it was something that could be solved easily, as he didn't feel the situation to be serious.
"It said the weak Parachronic gene with life properties is unable to keep with the constant, rapid death and rebirth of my cells. Would the situation change if I'm able to make the Parachronic gene stronger?" Silas thought to himself.
The fact that he was dying was surprising and somewhat depressing, but Silas was able to recover his mood quickly.
From what he read, the situation wasn't urgent as he still has over 200 years more to live, but that doesn't mean he's going to be laid back and relaxed about it. Also, 200 years is a very long time for him to find a solution to his problem.