Se-kyung, better known as Sofia, came from the mountains—born into a poor family with a big dream: to become a successful actor. But poverty and her father's growing debts made that dream feel almost impossible. Desperate for a way out, she decided to look for work in Seoul. However, fate had other plans. One day, loan sharks came and took her father away. Before he was dragged off, he managed to help his family escape by hiding them in the back of a large truck. His final words to them were a promise—they would reunite at Namsan Seoul Tower. But everything changed when they were taken in by a wealthy family... a family full of secrets, darkness, and hidden cruelty.