She is the illegitimate daughter of Jang Se-joon who is kept hidden from the public to protect his political career. After her father's affair was discovered, An-na was exiled from Korea and grew up in Spain at a convent, under the constant surveillance of her cruel stepmother Choi Yoo-jin. An-na has developed a social phobia and experiences panic attacks from flashing lights, a result of PTSD stemming from her past connection to the death of her biological mother. She returns to South Korea from Barcelona and becomes a pawn in her stepmother's plan to control her husband's political career from behind-the-scenes. She later falls in love with Je-ha.