Since last night when Yang Xi checked out the No.4 Middle School forum, she knew Ren He was in Class 5 of the first year, which is why she mentioned having a small request to the old principal this morning.
The principal would never agree to anything underhanded, but changing classes was a trivial matter, especially with a legitimate reason like admiring Yang Lan's teaching style. In reality, Yang Xi didn't even know who Yang Lan was; she just made up a lie after a quick search on the official No.4 Middle School website. She was actually worried about being exposed just now.
Yang Lan also heard about this and thought to himself, I didn't expect I'd become famous. It seems writing books is useful after all... As he was feeling self-satisfied about his rising popularity, he had no idea he was just being used as a shield...