The game has only one kind of currency, and that's money.
As long as players have enough money, they can buy new buildings, new teaching equipment, and purchase new textbooks for their students.
In the beginning, players have very little money. After buying textbooks for the initial twenty students, they're nearly broke, leaving Liuzi no choice but to let the students satisfy their hunger as they please, use their natural skin color as their uniform, and as long as their sleeping areas aren't too close to the toilets, it's fine.
This arrangement resulted in a severe problem, namely that on the first day's end, he was shocked to discover that half of his classroom had disappeared.
In a panic, he opened the game log and found out that his school hadn't provided enough dinner, so the students decided to solve the problem themselves and ate the school.
Upon seeing this message, Liuzi wanted to cry but had no tears.