What if the plot twist are--- the sister is not completely innocent 
The reasons that "President student"(i don't remember his name😀) do this because the teacher(sister) is having an affair with his dad and make his mom goes insane
Since he also have a pyscho side, he took this chance to play a "game" .
So he gets his revenge for his mom and enjoy the situation.
And the sister die is not because of the loan but
she got scared that this affair news will spread and her brother will know... So she jump..
.
EHHH IDKK-- or maybe he just born pyscho n the sister is actually innocent .. Oh wellll
♡ ∩_∩
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♡ ʜᴇʟʟᴏ(•̀’◡’•̀)ﾉ 。 ♡
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