"If only I could find a way to read those novels as well. At least then, I would have a rough understanding of what I am going to face."
He knew what kind of threat the Main Character in the Eastern Continent was. Although Ye Liang had a system, but it was a novel where he went from weak to strong.
Even with the system, he took quite a lot of time to grow strong enough to become a threat. He also had many opportunities to become stronger along the way.
As long as Eren kept an eye on him, not only could he stop him from becoming a threat, but also use him to his own benefit.
On the other hand, he didn't know what kind of people the Main Characters from the other three novels were. All he could do was take a guess from the titles, which was oftentimes misleading.
The only person who knew about the other three books was the author, who stubbornly refused to accept that he was the author.