55:15 Never Too Late (2021)

The main leads in 55:15 Never Too Late revert back to their younger self just like 18 Again. They all have regrets that they want to try and fix.

After watching the trailer of this series, this remind me of the movie "Miss Granny" which was adopted by so many other countries.

20 Once Again (2015, China) + Twenties Once Again (2018 TV Series)
Sweet 20 (2015, Vietnam)
Sing My Life (2016, Japan)
Suddenly Twenty (2016, Thailand)
Sweet 20 (2017, Indonesia)
Miss Granny (2018, Philipines)
Oh! Baby (2019, India)

-Sea Tawinan and Nanon are in it
- Has a complicated BL side storyline
- Fantasy
- About second chances at life with hidden identities.

An old and aging uncle has a second chance for romance. He went into a mysterious photography studio to have his picture taken and left the studio looking decades younger. His younger self met a director of a modeling agency and fell in love.

Both dramas are focused on life stories about dreams, regrets, family and character growth. They have a similar vibe and they follow multiple characters on their path to healing and happiness.