I think most Japanese bl doesn't follow that trope. My recs:
Cherry magic!
Hidamari ga kikoeru
The path of a star
The Pizza Delivery Man and The Gold Palace
Untouchable
Taming the Tiger (historical tho)
Take care of my housekeeper
Paid(Fujoking)
Far Away From Cold
Surge Looking For You
Private Scandal
girl half of these feature the ultra rich as the main characters . one of them literally has gold palace in the name.
Yo! I made a huge mistake I thought you meant the main characters being rich other than the ml bro i'm sorry lol
I gotta fix my eyes mb I got confused
I became the lousy side top
Roommates (Young Seok)
Ashita wa Docchi Da!
Neighbor's Rice Cake.
Don't Mix Business with Pleasure!
One room TA
Shiba-kun to Shepherd-san
Just Something I've Heard
Pass, Nonpass
Chiguhagu na Kiss
Don't forget that I like you
any bl where neither of the main characters are rich? lowkey sick of seeing the same large ass penthouse asset where the ml lives . also where they aren't students either. just normal working adults. ty <3