She was never jealous of her. Shinye is her sister after all.

Sojin knows she's already blessed just being one of the "Park's". But when an incident revealed the truth of her identity, she was forced to give up the life of luxury she was used to. That's when she realized that what she believed all her life was wrong.

And now Sojin knows that she will do everything. She needs to claim back what she knows should have been just for her from the start.