The legendary Gambling King Ethan accepts the dying wish of his master Victor—to protect the Du family for three years and marry Victor’s only daughter, Diana. Hiding his true identity, Ethan quietly safeguards the family and stands by Diana’s side. Yet his loyalty is met only with disdain and mockery, which he silently endures as the three-year promise nears its end. With just days left, Diana is lured into a gambling trap that threatens to ruin the Du family. Ethan finally steps in, using his unmatched skills to defeat their rivals. But once his promise is fulfilled, Ethan walks away—leaving Diana desperately searching for him.