"Pearl in Red" is a meticulous and intense revenge chronicle where two women meticulously plot to uncover the dark truth and hidden sins within the powerful Adel family. After her kindhearted twin sister, Kim Myeong Hui, meets a tragic fate, Kim Dan Hui abandons her own identity to live under her sister's name. She embarks on a determined quest for revenge, aiming to dismantle and take over the Adel Group. Simultaneously, Chloe Lee, whose life was shattered by an unexpected family accident, also pursues her own vendetta. Adopting a new identity as a world-renowned brand consultant, Chloe infiltrates the Adel Group with her own carefully laid plans. However, as both women close in on their targets, their intricate strategies begin to unravel when faced with unforeseen obstacles, threatening to expose their true intentions and identities.