Same mysterious and manipulative husband. Relationship seems perfect but the wife soon begins to suspect the husband of keeping a dark secret. Both also have loving husbands to the wife, but Dear Liar's husband is also pretty mean to her while FOE's husband is only nice to his wife and nobody else really.

ML likes FL first (this one actively chases after her tho) but both really REALLY like her.
Suburban/Small town setting
Same quirky humor
Serial killer after the female lead
Both these shows add some aspects of a thriller in the drama which juxtaposes the bright romantic tone the show presents itself as.
(Both shows are able to still stay light throughout it tho)

Rich student setting

*is also a law drama

Death of a student / mystery

School violence

Rich kids