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- Drama: A Tale of Two Sisters (English title) / Sincerity is the Way of Heaven (literal title)
- Revised romanization: Jisungimyun Kamcheon
- Hangul: 지성이면 감천
- Director: Kim Myung-Wook
- Writer: Kim Hyun-Hee
- Network: KBS1
- Episodes: 135
- Release Date: April 29 - November 1, 2013
- Runtime: Mon-Fri 20:25
- Language: Korean
- Country: South Korea
Se-Young (Park Se-Young) was adopted when she was a young child. After she reunites with her birth mother, she becomes torn between her adopted family and birth family.
Se-Young works part-time for a broadcasting company. She dreams of becoming an announcer. Jae-Sung (Yu Geon) is a producer at the broadcasting company. He is from a wealthy family and has a warm heart. They fall in love.
- "Sincerity is the Way of Heaven" takes over the KBS1 Mon - Fri 20:25 time slot previously occupied by "Cheer Up, Mr. Kim" and will be followed by "Melody of Love" November 4, 2013.
Additional Cast Members:
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