They didn't even show much, if any of the second couple, how could you like them more?
The black hair guy is working in sex club or BDSM ... The other guy " pink hair " is his childhood friend or could be his little brother - they had a long-time relation - . Needless to say the black hair guy don't realize the other guy's feeling ( or don't want to realize them ) because of " friend - brother zoon " .... That's why I think it could be more interesting to watch .
Guys .. Those are just my guesses nothing more .. and everything I said is in the chapters that are released here .. so I am not spoiling anything
their relation feels more like prostitution of some kind ... sorry guys !!Still can't help but read more ... I think I'll like the second couple more