His Secret Lover Is Another Man's Bride - Episode 12

For six years, wealthy heiress Iris stayed as a secret lover to racing heir Rhett, living only as a substitute for his first love. Disheartened and exhausted, she decides to end this humble relationship and accepts the pursuit of Elias, the heir of a prestigious medical family who truly treasures her. Rhett pays no mind at first, until he witnesses Iris accepting Elias's proposal. He finally realizes he has long been in love with her and tries desperately to win her back, only to be rejected repeatedly. In the end, Iris marries Elias and gains sincere, undisguised love and preference, while Rhett spends the rest of his life drowning in regret.