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Park Jin-hee as Kim Myeong-hee / Kim Dan-hee
Kim Myeong-hee: The older of the twins, who works as a nurse and dreams of having an ordinary family, tragically dies. Left orphaned at a young age, she dedicated her life to protecting her twin sister, Dan-hee. To raise money for Dan-hee's surgery, she gets entangled with Tae-ho, but ultimately finds herself exploited and betrayed while pregnant with his child.
Kim Dan-hee: The younger of the twins, who sacrificed her life and lives under her deceased sister's name, plots meticulous revenge to take over the Adele Group after learning the truth behind her sister's death. She raised her deceased sister's son, Park Min-jun, as her own child in the Adele family and is determined to protect him from any danger plotted by Jung-ran. To crush Jung-ran's dreams of power, she strategically positioned her nephew Min-jun as Adele's successor. She herself climbed the corporate ladder, initially working as a jewelry appraiser before ultimately becoming the group's president.
Nam Sang-ji as Baek Jin-ju / Chloe Lee
After being betrayed by a friend and losing her father in a horrible car crash and explosion, she reinvents herself as a top brand consultant and infiltrates the Adele Group to get revenge. Her life takes a complicated turn as she becomes embroiled with her former lover Min-jun and his half-brother Hyun-jun.
Kim Kyung-bo as Park Min-jun
Dan-hee's nephew, who is the first director of Adele Group. The shadow of his mother's status as a mistress haunted his childhood. As a grown man, he faced relentless succession struggles and suffered the crushing loss of his first love, Jin-ju. His life is turned upside down by Chloe, a Jin-ju lookalike. As he uncovers her true identity and the Adele family's dark secrets, he transforms into a man determined to protect his love at any cost.
Kang Da-bin as Park Hyun-jun
Min-jun's half-brother and Jung-ran's son who is the second division head of the Adele Group. Despite his bold and cunning nature, he shows little interest in vying for the succession. Only after losing Jin-ju did he realize she was his first love. Chloe's appearance sparks a growing obsession, clouding his judgment and driving him to make destructive choices.
Choi Jae-sung as Park Tae-ho
The chairman of the Adele Group. Coming from a poor background, he married into a prominent jewelry family and manipulated his father-in-law's will to divert his wife's family's wealth to himself. He expanded the family business from a jeweler into a large corporation, with the sole goal of making Adele the world's top company. Ruthless and unscrupulous, he uses everyone, including his own family, as pawns to achieve his ambitions. A ruthless master manipulator, he doesn't hesitate to put Dan-hee and Jin-ju in harm's way to protect his own power and luxurious facade.
Kim Hee-jung as Oh Jung-ran
Tae-ho's wife who is the director of the Adele Gallery. She rises from a floor-cleaning maid to head of a large corporation. Driven by ambition, she orchestrates the poisoning of the landlady and forges her master's will to secure her position.
Cheon Hee-joo as Choi Yu-na
The head of the Adele Group's new business TF team. She has a complex relationship with Jin-ju, fueled by long-standing feelings of inadequacy. Believing Jin-ju stole her dreams of becoming a jewelry designer and her first love, Min-jun, she ultimately betrays her, claiming Jin-ju's success and life for herself.
