Plot

Na-Yeon (Lee Yu-Ri) is a bright woman. She supports her boyfriend Tae-Joon (Seo Jun-Young), who is from a poor background. Even though they have a daughter, Tae-Joon dumps her for his own success and goes with Se-Jin (Park Ha-Na). Se-Jin is the granddaughter of the President of Baekdoo Company.

Do-Hee (Lee Yu-Ri) is Na-Yeon’s twin sister. They have been separated since Do-Hee was adopted by a wealthy couple when she was an infant. Do-Hee now works as a reporter for a weekly magazine. For a story, Do-Hee investigates into the background of Tae-Joon. She discovers that she has a twin sister and Na-Yeon was dumped by Tae-Joon. Do-Hee also learns that Tae-Joon's mother got Na-Yeon hospitalized at a psychiatric hospital. Do-Hee visits Na-Yeon at the hospital, but a fire engulfs the hospital and Do-Hee dies. Na-Yeon then takes the identity of her twin sister.

Drama: The Promise (English title) / Heaven's Promise (literal title) Revised romanization: Cheonsangui Yaksok Hangul: 천상의 약속 Director: Jeon Woo-Sung Writer: Kim Yeon-Shin, Heo In-Moo Network: KBS2 Episodes: 102 Release Date: February 1-June 24, 2016 Runtime: Mon-Fri. 19:50-20:25 Language: Korean Country: South Korea Cast           Lee Yu-Ri Seo Jun-Young Song Jong-Ho Park Ha-Na Lee Yu-Ri Lee Na