they are similar in the story
Brother taking care of his siblings and suffering the most for them
But I liked the korean one more to be honest

It's similar in so many ways
the obvious Romance
the suggestive BL situations
the bickering between them
one is light the other is serious
the detective cases

Similar relationship between two detective one older than the other
Both Bromance dramas
Both have their funny episodes
the crimes aren't that serious or gore or violent
Bothe are light hearted dramas for bromance fans

Same relationship between senior detective and junior fresh one
they are both roommates in Detective A&B
there are love interests for both I think
there are detective cases to solve
senior detective treats junior very rude and superior

Very Brave and devoted Male lead
they are similar in styling , vibes and era I think
One and Only is more to the romantic side but Nirvana is more to the political side
non the less ,,,, I feel their similarities watching it

Friends and family are everything to the young
the dramas are similar in the comedic tone and the friendship
also the family values

Same Miserable couple
Same Youth problems and defying all obstacles
Same painful hardships ,, different details

They are the same school romance drama ,, the second male lead has psychological problems in who are you school 2015 drama
the same in spring is green the first male lead has psychological problems because of his parents
Youths problems and romance

Both republican era dramas
Both have struggles in desperate times
Both are fighting to protect their country and keeping it safe in chaos and war
killing people is the most common theme and it shows How turbulent time it was

Both Youth dramas with tournaments and the journey of achieving goals
Winning is not the goal but having good friends that back you up every step of the way is the most important message in both of them
Both have amazing Values to every young man and woman in competitive field no matter what the kind of the sport is ,, it's the same

Similar Sports drama with a lot of friendship dynamics and family like in sports spirit
Both are really good youth dramas with positive messages

The same Republican Era
The same war fare and spy work
The same antagonist with miserable love life and revenge
even the decor and styling are the same