Private Prince, Hana ni Arashi Recommendations
Both mangas are similar in a way that the girl ends up with someone who is rich.
Hana ni Arashi = girl ends up with the sole billionaire heir.
1/2 Prince = girl ends up with a Prince of a foreign country.
Well 1/2 Prince is longer compared to Hana ni Arashi and is somewhat smutty. I prefer Hana ni Arashi because of how cool the main guy is.