Original title (KO): 천국보다 아름다운 (Cheongugboda Aleumdaun, More Beautiful than Heaven)

The story of an elderly woman, Hae Suk (Kim Hye-ja), who lived a happy life with her husband until she died. Wishing she'd be her 'real age' when she met her husband in heaven, she's surprised to see his younger self there when she arrives.

https://www.themoviedb.org/tv/254389