He Chose My Sister, So I Married the Mafia DonEpisode 1

In her past life, Claire was hated by Jason for forcing him to marry her, and she died with nothing but regret. After being reborn, she decided to give Jason the woman he truly loved, Emily, and willingly took her place as the bride of Adrian, the Mafia Don rumored to be ruthless, heartless, and even impotent. On their wedding day, Jason mistakenly believed Emily was the bride and came to take her away. But when he realized the bride was Claire, Jason was even more devastated.