Ordinarily, the System is meant to protect the host, as the host is usually in a weaker position.
However, Xu Chang'an, who exists as the "last line of defense," the "savior," the "hope," is not exactly a Child of Heaven; perhaps a higher existence is more fitting.
Thus, while it seems the System is taking care of him, in reality, it's entirely the other way around.
If you think about it carefully, you'll realize that even when he exchanges rewards from the System, he's ensuring the security of the System's existence.
After all, if the System holds no meaning to Xu Chang'an, then it truly loses all reason for existence.
Yet lately, Xu Chang'an has been increasingly resistant to the System, even fading its presence from his life... This has become quite a significant crisis, but the System has no way to assert itself in Xu Chang'an's mind while in the presence of the young woman, thus it can only gradually fade away imperceptibly.
