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Hak-ju is an abbreviation for 'Haksang juim' (Hangul: 학생주임 )'.
The Korean word "Hak-ju" is translated as "The chief teacher of student management".
Generally, men are charged with this position.
At some point in 2001, Kim Byeong-tae was playing around with a Student's Chemical Solvent and accidently spilled it over the garden which killed the trees, as a result Hak-ju confiscated his Chemical Solvent and locked it, the student left a note for Byeong-tae to get it back although Lee Hui-min managed to get it in March 14th 2001 in order to kill The Tree Ghost.
Hak-ju apparently has very bad memory and uses his medals to remember the passcode for the safe-lock.
- Kim Hak-ju is just a tentative name as "Hak-ju" is translated as "The chief teacher of student management" and is not an actual name.
- In the original version Kim Byeong-tae was playing with a rake which was confiscated as a result and the cleaner wasn't able to water the trees which died out, indirectly related to the chemical solvent you get.
- In the original version, he remembers his passcode via the number of balls in each basket, which is rather confusing for a forgetful person, this was changed to medals in the remake.