They are both about two fathers who look after their young child as they start going to school.
Both families were judged by outsiders due to their unique family situations.
P&D is LGBTQ+ while Two Fathers is not
Wholesome family Taiwanese show
All 4 fathers are nice and kind-hearted

They both have a parallel universe in which the main male character can travel to and from under special circumstance.
Both female leads are police officers.

-Both are noona/age gap relationship
- The relationship started with a secret
- Both leads knew each other through one/both siblings.
- Both leads work in the same building/company

- Both male leads have drastic appearance changes as they appear more handsome when they grew up, thus looks/appearance is one of the main theme in both dramas
- Both leads knew each other when they were children
- There is a boss and employee relationship in both dramas
- Both male leads are rich
- When they met up again after years, in both dramas, the leads start off on the wrong foot.