The Promise(2016)

The Promise is a Korean drama centered on betrayal and vengeance. Na-Yeon sacrifices her university dreams to support her boyfriend Tae-Joon, only to be abandoned when he pursues Se-Jin, the granddaughter of a powerful company president. After Na-Yeon's death, her twin sister Do-Hee—a tough-minded magazine reporter—assumes her identity to seek revenge against those who wronged her. As Do-Hee infiltrates the world of wealth and privilege under her sister's name, she crosses paths with Hwi-Kyung, the heir to Baekdoo Company. What begins as a calculated scheme spirals into unexpected complications as Do-Hee navigates dangerous secrets and forbidden attraction within the corporate elite.