there's a lot of things i find fascinating with the walls mv but especially the idea of "what we see/are shown" vs "what goes on behind the scenes"
L being surrounded by the couples is what we are presented with; the idea of heterosexuality
L has always been a target to that-

-image of the "boyfriend in the long-term het relationship"
yet behind the scenes, we see him alone getting ready to put on that performance
then in kmm joe and his partner are backstage
so once again L performing is what we see but not the bts of their secret reunion and it-

is interesting how L performing and joe and his partner kissing literally blend together like they're happening simultaneously but there's only one we can see as the audience
so essentially L is saying, don't believe everything you see bc A LOT more goes on bts