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Having successfully infiltrated the academy, this was the position Tang San had carefully calculated beforehand. With the help of shadows and his night-cloak, it was very difficult for anyone to detect him.
The reason for this plan was related to his experiences over the past few days.
Every day he used the back door to enter and exit. It's true that the Redemption Academy had an Alarm Formation for defense, but as long as the doors were opened normally, the alarm would naturally not be triggered.
When he left through the back door, he had run into some Monster Clan Students and overheard their conversations.
One of the Monster students mentioned at the time, "Let's sneak out for a drink tonight! I've already made arrangements with the gatekeeper."
This caught Tang San's attention, and in recent nights, he occasionally came out to observe. Sure enough, groups of students would sneak back in through the back door very late at night.
