I thought I was the only one who liked this series LOL. In my honest opinion, Season 2 was really fresh due to its cast of actors being not as well known as Season 1. They used what they had, and a lot of what happened to Jinah also happened to me in my high school experience. Upon watching this a year out of HS in 2018, a lot resonated with me and helped me a lot with not feeling as alone.
Fluff aside, I don't think it's anyone in the cast who is the master. I'm thinking it's an outside source that they might reveal later in the series if it ever picks up or is ever even mentioned again.