Between the third class in the afternoon and the twenty-minute self-study, there are five minutes allocated for a restroom break.
This is a rule not explicitly stated in the senior year schedule, but tacitly agreed upon by teachers and students alike.
No one gets caught within five minutes, but beyond that depends on the administrative staff's mood.
Jiang Nian usually goes over five minutes, heading straight to the cafeteria to eat. If caught, Lao Liu warns him; if not, he enjoys a chicken leg meal, either way it's a win.
Every time, whether he goes upstairs within those five minutes depends solely on his mood.
What? Get demoted a class?
Demote my ass! Lao Liu owes me! Aren't you going to thank Brother Nian?
Yu Tongjie has also contributed a little leftover heat, and now Jiang Nian doesn't want Yu Tongjie to get demoted because he can... use Jie the Turtle to command Lao Liu!
Lao Liu, with this secret, I'll eat throughout my senior year!