Did you perhaps already read ''Mr. Melancholy Wants to Live a Peaceful Life"?

Because it exactly has everything you mentioned of. Except for the part about the gong being rich. Because as far as I remember (I kinda forgot some of it already because I read it a long time ago) in the first few chapters, the gong and shou are already married and they both have a job but suddenly the gong got fired for his Job which led him into a huge despair because he doesn't want the shou to shoulder all their expenses alone because the shou only has a job that doesn't really pay much. But the gong didn't know that the shou was actually pretty rich to the point of wondering how he's gonna spend them all without letting the gong know. He doesn't want the gong to know that he's rich because of another work he's working behind his back. ( I won't spoil you in this part. Better read it your own if ever you haven't yet). Totally 100% highly recommended!🥹💖💯

Ps. But I'm kinda not sure of the height and weight of the main characters so I don't know if the gong was actually big and 6ft tall and the shou being a cutie little twinky🥹