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- 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
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.
- "The Promise" takes over the KBS2 Monday-Friday 19:50 time slot previously occupied by "All is Well" and followed by "Secrets of Women" on June 27, 2016.
- First script reading took place January 1, 2016 at KBS Annex Broadcasting Station in Yeouido, South Korea.
Additional Cast Members:
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