
I do know in a real life scenario this would be f*ckd up, but being with fictional characers in a fictional set up such as yaoi which has its own fictional "rules", it doesn't trigger me at all. In fact i find the developement and the teacher to be a little bit different and more interesting than what i usually find in yaoi.
Guys, is fiction, is erotic and recreational, is not the real society, no need to apply ethics.

The author used foreshadowing in the beginning when Bum said he was a relative while trying to get in. Sangwoo's mother had Bum before having Sangwoo, she left Bum's father and started a new family where she had Sangwoo, Bum's father got a new wife, and later they died. Bum's uncle knew this, he said Bum was just like her mother (sangwoo's mother), and he resented her brother for getting the beautiful one (sangwoo's mother again). That's what i think, also the physical resemblance between the two wasn't the trigger of the OTP (it was Bum's behaviour), so it doesn't make sense to emphasize the mother's face to say "big reveal, Sangwoo "loves" Bum because he looks like his mother".

I think the speculation about Bum looks like sangwoo's mom has been around for long..it started since sangwoo jerked off to the sight of Bum hanging in the basement...some commenters here started the speculation. All u said cud be true. Lil sangwoo looks like bum and sangwoo's mom looked like Bum....that or Koogi totally run out of imagination to draw new faces lol

if that's the case, we got incest here

No, I'm pretty sure if anything they might be cousins, cause you remember how the uncle complained that both Bums mom and dad got what they deserved ? aka their deaths? Well, it implies that the parents Bum had were his real parents. And since Sangwoo's mom lived single after the death of the husbando its not likely that it could have been the same people. The timelines just wouldn't match up. ╮(▰) ̄▽ ̄)╭ ✧

THEY ARE NOT BROTHERS, or related what so ever. This is just another chase of two asian people looking alike(Yoonbum and Sangwoo's mother). Yoonbum's parents died so as a result he had to live with his uncle. His uncle use to date Yoonbum's mother but Yoonbums mom left his uncle for his father and then they had Yoonbum.
Yuyang doesn't even have to grow some balls, Li Huan is doing all the hard work lmao. This is just typical manga character's absurd communication skills, thank god i'm already immunized or i'd be punching the screen ┑( ̄Д  ̄)┍