Um so spoiler
So jun decides to break off(not exactly break off like he distances himself cuz jun suffered so much bcoz of yohan wanted attention so bad) their so called friendship after he hears about yohan true personality from his(yohans) sister when jun and his mom visited yohans house when yohan was out and he keeps it a secret that he heard about yohan from his sis till graduation cuz after graduation he flees to US to his parents for 3 months i think this arc was soo satisfying cuz yohan went mad looking for jun for 3 months legit mad and then jun joins top college in Korea but yohan also joins it without knowing and they coincidentally become roommates i think ( it's been too long since i read the novel) and they kind of make up cause yohan suffers a big accident because of jun(not exactly jun fault tho)(you know the scar on his back in au episodes) and they become lovers later after some shit idk man i forgot I hope my explanation was okay cuz I suck at writing

Just wait until juns ran away (〜 ̄△ ̄)〜