I also prefer watchingthis dramas where the omance is central, I'm not keen when other hings override the romance that's why I don't watch thriller/detective based things. These dramas are ones which are either good or very good in my opinion!
K-drama
-Cheese in the trap
-My secret romance
-My love from the stars (considered a modern classic, highly recommend! It's one of my favourite kdramas)
-The heirs
-Playful kiss (one of the classics! Highly recommend)
-Shining inheritance (one of the classics Kdramas. Highly recommend! there is other things going on but these things revolve around the mains still. This drama was very famous when it came out!)
-Prosecutor princess
-Heartstrings
-Goong (one of the classic Kdramas! I highly recommend)
-Pinocchio
-Goblin
-Oh my ghostess
-Longing heart
-Legend of the blue sea
-Splash splash love
-Queen of the ring
-Something about 1%
-W
-High society
C-drama
-A love so beautiful (I highly recommend!)
-Customize happiness
-Because of you (there are other things going on but again relate to the leads, I highly recommend it though!)
-Fifteen years waiting for migratory birds
-My little princess
-Master devil do not kiss me
-Pretty man
T-drama
-Marry me, or not?
-Attention love!
-Mars (classic! This drama Is really beautiful!)
-Meteor garden [2001 version, this came before boys over flowers and I generally think it is way better. It's probably the most famous Taiwanese drama]
-Miss in Kiss (newest Taiwanese remake of playful kiss)
-Devil beside you (a classic!)
-Autumn's concerto (considered a modern classic!)
-Love @ seventeen
-In time with you
-Murphy's law of love
-Moon river