I really like the realism (tinged with the "melodramatic" side of Dramaland) of Taiwanese series.
This drama begins with a very rom-com tone, before the focus is put on the investigation and the tone then becomes more emotional.

The plot is interesting: a math genius investigates a 23 years old cold-case, involving his father. He meets and falls in love with FL, then discovers that she is the daughter of the victims of this cold-case.

The characters are well developed:
- I really like the ML's evolution, from an hyper rational cold man to a caring and attentive boyfriend.
- I admit that I'm more reserved about FL, whose acting skills didn't convinced me.
- the characters of the friends (prosecutor and policeman) are there for the humorous touch. They really cannot be taken seriously!

Romance is well developed, step by step, from interest to trust, then love, support, protection. Ship moments are frequent and really cute.
The OSTs are only 2 or 3, but I really like the song that accompanies the emotional moments.

The production is lively, dynamic, so there is no length, no moment when the drama becomes boring.

The MAJOR FLAW of this series is the very low budget:
- no action scenes
- all the drama is done in a few locations (apartment, office, restaurant, school, hospital, etc.)
- the elements of the investigation (we only see 2 or 3 police officers in action) are not very credible

However, I watched this drama until the end because the actors are good (especially the ML) and the story is well told. Everyone wants to know how the plot will end.

=> Some Taiwanese directors really master the art of telling good stories with a very small budget.