Sunshine With Me (2023)

Large age gap between Older FL and younger ML

Both have ex lover storyline that is focused on during the drama

FL is very senior in rank

ML learns trains under her

both have ex lovers storyline that is focused on

Both are noona romances and the male lead have been in love with female lead for years before finally having the courage to pursue her

Both are workplace romance between older man and younger woman and both drama have multiple pairings with their own storylines

These two dramas might not appear very similar from the synposises, but they are both a mix of workplace/mature relationship dramas with strong female characters.

Where "Sunshine of my life" revolves mostly around the main protagonist, "Stand or Fall" also follows the storylines of her two friends.