有一种囚犯叫学生有一种监狱叫学校
[yŏu yī zhŏng qiú fàn jiào xué shēng yŏu yī zhŏng jiān yù jiào xué xiào]
Translates to 'There Is A Kind Of Prisoner Called Student, And There Is A Prison Called School', expressing feelings of being restricted or oppressed within academic environments. It comments sarcastically on schooling constraints on freedom.