BurningBoiceM wrote: Mine would be "Stars falling from the sky". Its literally A-W-E-S-O-M-E
It is nice but ...kinda well known and new drama - so it isnt hidden gem but popular gem.
Hidden gem is usually littlebit older drama what is forgotten by everyone but actually is good drama with good actors, it isnt mainstream one and this is reason why so few people know it. Think about word - "hidden"
I add one more ( i posted already some earlier) :
Cheap Love -
http://mydramalist.com/japanese-drama/2585/cheap-love