NiSkywalker:
Stupid question ))) what exactly means BL, I mean I know it's something close to LGBT or it means bromance where gay theme isn't said but implied? Like School 2013 and My country (they both are about friendship but you should be blind not to see these guys are more then best friends, they have crazy chemistry and so emotional bond)
Bromance: Strong friendship between two men. Brotherhood + Romance. In case of Chinese shows with all their censorship rules Love story between same gender is sanitized into friendship. So usually bromance in such cases is censored romance.
LGBT: Considered to be realistic stories of the community.
BL: Boys love. Fantasy love stories between two men with all the troupes, rainbows and unicorns. Straight guys turning gays or everyone on the planet is gay. Some cute troupes, some ridiculous and some quite problematic but usually kind of say romance drama stories albeit featuring male x male.
For detailed explanation check out term 'Yaoi'.
Hope this helps :)