The Promise is a 2016 South Korean television series starring Lee Yoo-ri (in a twin role), Seo Jun-young, Park Ha-na and Song Jong-ho. It airs on KBS2 on Mondays to Fridays at 19:50, for 102 episodes with the first episode airing on February 1, 2016.
Lee Na-yeon is made an orphan when chaebol heiress Park Yu-gyeong causes the death of her mother, Lee Yun-ae, in a traffic accident. Yu-nae and Yu-gyeong had been rivals in love for the same man, Jang Gyeong-wan, with Yu-gyeong ensnaring him into marriage by claiming the child she is carrying is his. Jang attempts to make amends for abandoning his college sweetheart by trying to give the orphaned Na-yeon a home, much to the anger of Yu-gyeong and the jealousy of his daughter Se-jin. When Na-yeon discovers evidence that her mother's death may be more than an accident, she forgoes the chance of a life of wealth and privilege for an orphanage.