Although Highway Family particularly focuses on a homeless family and Nobody Knows focuses on child abandonment they share a lot of common themes based on helpless children and who really is to blame?

Both are movies about people coming to terms with an accidental death, about what it means to live with grief and regret.

Both shows explore a crime in a country side/ village lole setting and also share a common theme of familial relations.

Both films revolve around the themes of regret and guilt and have characters that try to come to terms with it.

They are both stories of two people marginalized and outcaste by society and their own families in love. It shows the happiness in simplistic things.

They both have similar atmosphere in terms of mystery and attraction. They're both about men being attracted to women who are suspected of a crime.

They are both dramas that showcase the emotional aspect of crimes-the impact the crime has on the victim’s family and the impact it has on the people investigating the crime.
Through the darkness covers multiple cases and is semi-non fictional and ANKH covers one case. I also found Muro Tsuyoshi’s character and portrayal to be similar to Kim Nam Gil’s character too.

Both are nuanced and realistic.

Although a model family is way darker, they're both about ordinary people falling into a mess involving money or as in enka's case: money in the form of gold.

They're both about transient aspect of life, about broken dreams and feeling 'lost' in life.
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Both have a similar plot, that the relationship between a parent and child is tested during a tough situation.

Both deal with 3 siblings navigating through life and love and that the only time they spend together is over food. Although food plays a more central role in Eat, drink, man, woman.

Both are really good thriller-comedies and share the same vibe. Both even have the perfect amount of mystery involved.