Idk what to tell you I love to watch foreign movies and tv shows... it can be a bit hard if you're not flexible to see something not in English but I recommend you do...
The series brings something new and unique to the table and mixes very well between a very "fun" cute innocent childish "kinda" perfect world
with great set great sounds and music and... (unimpaired by reality and life )
while keeping very well the "secret" and the thriller narrative
secret agent style....
The violence the murders the corruption the business
the series perfectly connects to worlds together...
(for full disclaimer I haven't finished watching the show yet...)
but to my opinion it is a bit cheesy and stereotypical from time to time...
But all of that's fine and forgivable with how well done it is...
I can talk about the series a lot... Analyze it deeply... But I don't feel the need... I'm just here to recommend...
Which I do... Very highly....
it perfectly connects tow worlds...
Both "childish" both "interesting"
it's just unique... (maybe it's not but I haven't got to see anything like this in all of my TV loving life)
should you watch it...?
ask your self this... It's in Korean if that's something you're OK with... Either by understanding or with subtitles/...
Then you should definitely try it... As simple as that...