i think it’s to show that jaehyuk doesn’t know about homosexuality/the struggles of gay men (garam). Someone who is bi have the privilege to decide if they want to pursue the same or opposite gender, but gay men do not have the same privilege. he was portrayed as homophobic at the start so it would make sense for him to not be educated about it. Him acting like that still implies that he doesn’t get how Garam feels

The talk about being gay and quitting being gay is so soo stupid(T△T) Does BL authors doesn't know bi & pansexuality exist??!