modern

love triangles or childhood related plot

Hate both but childhood related plot can become great when used properly like in It's Okay to Not be Okay


Tientsin Mystic or Detective L

Haven't seen either but if I had to choose, then  Detective L 

Goblin or Crash Landing on You

Goblin.

Age of Youth (Korean ver.) or Youth (Chinese ver.)

Youth - I haven't seen the Korean version. 


TVN or JTBC

JTBV


Bitter blood or bloody monday?

Bitter Blood 

Voice s1 or s2

Secret garden

Oishii keiji or Runaway 24

n/a

SKY Castle or The World of the Married 

n/a

Her Private Life or What's wrong with secretary kim

WWWSK

Goblin or The King: Eternal Monarch 

The King: Eternal Monarch

A Love So Beautiful or Put Your Head on My Shoulder

this hard

Put Your Head on My shoulder 

Go Gio Squid or Love 020

Go Go Squid (dropped O2O)

My Queen (original) or Witch's Romance (remake)