Today, when the moon has no secrets left to uncover, humans living on Earth still harbor prejudices against professions.
This is because, although one can't generalize, different professions indeed have different atmospheres, and atmosphere easily affects people.
Gu Ran didn't know how long he could resist doing something he'd regret to Su Qing in the current atmosphere.
This isn't like the absence of trash bins on the street, where you—without any exception—take the rubbish home every time.
Whether or not to litter solely depends on morality, but the ability to resist the temptation of the opposite sex is also controlled by carnal desires.
And carnal desires, just like the appetite for food, are human instincts; who wouldn't eat when hungry? Who could resist being impulsive when the urge hits?
Being impulsive is one thing, but being in an environment like this, impulsivity can lead to accidents.