A fake marriage, a dangerous secret, and a Christmas that changes everything. When struggling designer Han Seo-yeon is forced into a contract marriage with icy billionaire Kwon Tae-ho to save her business and her ailing mother, she steps into a world of scripted romance, public lies, and private tension. But as rehearsed kisses start feeling real and the line between act and truth blurs, Seo-yeon must decide if she's willing to pay the ultimate price for a Christmas she never asked for.