Initially-straight male lead enters gay porn industry and becomes a bottom
Bottom male lead lived his life as a straight man going through failed relationships one after another, until he meets top and realizes the possibility he may not be all that straight after all
Kyuho Je, top in first couple, was exclusively attracted to women prior to meeting Kangha, bottom.
Bottom male lead was married and very much in love with a woman prior to her demise and his consequent meeting with top
Top wants to sleep with bottom to find out what it feels like to be with a man as he was exclusively with women previously. Turns out he isn't the type to refuse either gender that approaches him
Bottom male lead didn't even consider that he could be interested in men until he met top.
Top was previously only into women before he met bottom
Top gives me heavy bi vibes, don't remember if it has been confirmed so already or not
Top was married and had a child with his wife before she passed and he met bottom.
Walk on Water