They break up because of the age difference (brown haired bro breaks up w black haired guy) its gonna get sad latest chapter has a cliffhanger cause brown haired guy probably realized that the age difference is okay and maybe they get back together but black haired guy is heartbroken in some gay club/sex thing i cant tell u much tho cause i don't speak Korean and only translatet the comments on newtoki
put a spoiler at least. Respect.
Also he probably broke up with him cause of what the aunt said raws are currently at chapter 32 last update was yesterday
Spoil me now what happens and why is everyone freaking out☠☠☠