I was hoping they wouldn't time-jump and actually portray more character development. Maybe the older brother could mellow out after studying for 2 years away from his "rival" and being dumped by his first love.
Heck, it would have been better to have him come home during 'vacation' days to repeat the challenge and understand things.
Oh well, now to see if these children armed with lethal weapons will not immediately try to kill each other while the educators do nothing about bullying.