After the sudden death of her father, Go Eun-Sung is cast out by her stepmother along with her autistic younger brother, who soon goes missing. Struggling to survive, Eun-sung works tirelessly while desperately searching for her brother. Her fortunes take a surprising turn when a wealthy grandmother unexpectedly names her the sole heir to a vast inheritance. Seon Woo-Han, the arrogant and spoiled heir raised by this very grandmother, is stunned when she announces that all her fortune will go to Eun-Sung. As Eun-Sung and Woo-Han’s worlds collide, their clashing personalities and intertwined fates take a dramatic turn in the face of hardship, growth, and unexpected love.