The Billionaire's Serendipitous Love

Two individuals with broken hearts and no hope in love anymore meet, Emily, who has been eagerly waiting for her boyfriend to propose to her finds out he is getting married to her best friend.
Devastated she agrees to marry a billionaire as per her mother's request, but he mistakes her for Olivia Emily's sister. Emily goes along with the charade and assumes her sisters identity. She agrees to a proxy marriage.
Despite trying to to move on, they couldn't shake off the memories and feeling they had for their past partners. Will they be able to find closure and move on, or will they be forever stuck in the past?