I Drew the Lich King from the Start, and He Urged Me to Build the Deer Terrace

After chapter 50, it's impossible to read anymore. Helping the enemy at the expense of one's own territory is all too obvious, yet no one knows it. But I had to meet you; it's like my ancestors were incredibly lucky to have such a good helper as you.

It's good, but the main character is a bit of a liability. He knows about the system, yet he's afraid of this and that, which makes him seem rather dim-witted.

Finally, the visibly rushed

Personally, I think there are a few minor issues: First, the protagonist's mindset is that of an ordinary person, not someone in a position of power. Second, the way some characters speak and the content of their speech are inconsistent with their status. Third, the protagonist is too weak.

I feel like I've been tricked by Lao Liu.

That's a fatal flaw! They were originally vassal states of the same empire, so how could they not know about dangerous areas on a map? Forbidden areas don't move.