Who Cares I Have Money

(1) Naoto is ridiculously rich.

Both Sei and Sugiura are being considered to inherit an estimated 2 billion dollars. Which ever one gets to keep it, they're going to be filthy rich.

Shinya Kaito’s planned to elope with his lover Yuriko but she was married off to a powerful man named Sugai. He swore to get revenge. 18 years later Sugai Nanami, her son, is bought by Kaito and used as her substitute. Kaito becomes a wealthy man after separating from Yuriko.