Male.mc is poor and he lives his life by trying to earn his daily needs for himself and his family. And the female mc is rich or from a noble family and is smart.
If you have something in this category I will be happy to look for it.

Chuusotsu Worker kara Hajimeru Koukou Seikatsu Roudousha

Okay, I'll give it a shot:

Ookami ga Kuru! and its sequel Shinyaku Ookami ga Kuru! - Completed. Shounen with mostly supernatural and action. There IS romance and it's quite clear, but not the main aspect. The male lead works to fight spirits for a living, the female lead tags along. One of my fave series~.
Hananusubito (TSUKUBA Sakura) - Completed. Shoujo oneshot. About a guy who flirts with rich girls to use their money.
Love Allergen - Completed. Shounen fantasy romance. A beautiful, rich girl and love-allergic male lead attempt to teach about love to a mythical being. The guy doesn't work for a living though if I remember correctly.
Wild Wing - Completed romance fantasy shoujo. About a girl who meets half-humans.
Teruteru x Shounen - Completed. Rich female lead and devoted male lead. He's her bodyguard (I don't remember him gaining money though). Sweet adorable romance~

And after searching the web, seems like these fit:

• Girls of the Wild's (Shounen webtoon)
• Billionaire Girl

I'll post more if I remember others~

** Shoujo & Romance Manga Lover || Cleaner-Typesetter**
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Quote from ImmLff

Chuusotsu Worker kara Hajimeru Koukou Seikatsu Roudousha

Thanks I will see into.

Quote from Elysia_

Okay, I'll give it a shot:

Ookami ga Kuru! and its sequel Shinyaku Ookami ga Kuru! - Completed. Shounen with mostly supernatural and action. There IS romance and it's quite clear, but not the main aspect. The male lead works to fight spirits for a living, the female lead tags along. One of my fave ...

Thanks for the suggestions. There are few which interests me. So I will give them a read. So if there are more do tell me.

And I finished Girls of the Wild long ago too.

Hayate the Combat Butler

Quote from Solunasky

Hayate the Combat Butler

Don't really like full on gag manga.

Quote from ImmLff

Chuusotsu Worker kara Hajimeru Koukou Seikatsu Roudousha

Man, this is such a good manga. Thanks for recommending it. Just wish it was translated more often, hopefully it continues. (So good I had to make my first post ever to say how good it was).

Quote from HerculeSSJ

Man, this is such a good manga. Thanks for recommending it. Just wish it was translated more often, hopefully it continues. (So good I had to make my first post ever to say how good it was).

You are right. It started to get better and I wanted to know how her family will treat him. But the updates are too slow.