Love at the end of his lie (Dubbed)

Jeong Seo Rin endures six loveless years of marriage. Her husband keeps his distance, and she assumes it's just his nature—until she discovers he has always loved his stepsister, treating her as nothing more than a placeholder. Heartbroken, she reveals the truth to the stepsister and leaves. In the end, it is the once-cold husband who drowns in regret.