Green Tree Castle's laboratory.
In the past, it used to be a transcendent academy.
Some ancient rules have been passed down within the Inner Circle, with little change even now.
The apprentice system is one of them.
Many members who join the Inner Circle need to choose a mentor.
With their mentor, they will truly embark on the transcendent path, and even receive many kinds of transcendent knowledge for free, without having to go to the White Tower to exchange.
Of course, Su Lu would not refuse.
Even Rod knew to learn from his seniors, so he didn't mind taking another teacher.
Furthermore, this was also a form of alliance and taking sides: "So...I wonder if I could ask the professor to be my mentor?"
