The SSS-Level Billionaire

Delivery guy Cole Morgan is bound to a system, gaining the ability to earn high interest. He quickly amasses wealth to become a tycoon. He helps Serena Sullivan, finds love with Wendy Quinn, and wins Serena Sullivan's heart. He is then kidnapped and forced into marriage by Faye Cho. Faye Cho is terminally ill, so Cole Morgan travels to the Sakura Kingdom to buy medicine for her, successfully obtains it.