Reading progress update: I've read 59 out of 276 pages.
It looks likes the plot's moving even though it's a repeat of what previously happened. The narrator accompanies Achilles again with some private teaching lessons, but this time the lessons are going to be taught by Chiron. Sooner or later, Achilles' mom would probably arrive and interrupts the MC and Achilles' bonding (I hope that doesn't happen).
Anyway, I hope this pattern doesn't repeat itself for most of the book. The main character so far is a lot more tolerable than Circe.
Edit: Fixed the total number of pages.