I just re-read the first chapter. Sooo... Junyoung thinks that Shihoon is Mari's lover because she calls both oppa (brother). But Shihoon is her real brother and her lover (my oppa) is someone else. So Junyoung feels guilty because he thinks he's fucking her friend's lover
I just re-read the first chapter. Sooo... Junyoung thinks that Shihoon is Mari's lover because she calls both oppa (brother). But Shihoon is her real brother and her lover (my oppa) is someone else. So Junyoung... Ookami
OMG I DIDNT GET IT AT FIRST BUT MARI IS THE SISTER OF HER BROTHER THAT SHE CALLS OPPA AND LIKES A DIFFERENT PERSON WHO SHE CALLS OPPA....