Hi could you please help me by recommending me some good romantic drama? I really love drama where there's a good looking man lead with weird and dork behaviour such as Fated to Love you, Master's Sun, or Cunning Single Lady. 

But if you have something that are better than them, please tell me! Thank you so much for helping me, I'm in my holiday and I don't know which drama I should watch :(

If you liked Fated to Love You, then you might like The Greatest Love. I'm pretty sure Dokko Jin & Lee Gun are related somehow. LOL

Heard it Through the Grapevine - I've put this one on hold, but the male lead is a handsome kid who is kind of timid and dorky. I don't know if he stays that way throughout the drama, but you might want to check it out and see.

A Gentleman's Dignity - male lead probably isn't as over the top crazy like the guys in FtLY, TGL and Master's Sun, but he comes with his own brand of oddness, imo.

Heart to Heart

Oh My Ghost

In Kill Me, Heal Me the male lead suffers from split personality disorder and a few of his personalities are bat shit crazy (in a good way). lol

Secret Garden also had a slightly odd, primadona type male lead.
Empress Ki - the emperor has some pretty strange and childish quirks to him. 

Love Me If You Dare - he's super intelligent and because of that he's not really great with people, so that leads to some weird behavior from him.




Boss & Me
Secret Garden
Healer
You Who Came from the Stars
Kill Me, Heal Me
From Five to Nine
Rich Man, Poor Woman
Rich Man, Poor Woman is a good rec. The guy is a neurotic workaholic and he acts like a weirdo for most of the drama.
 Splash Love, only 2 hours long but very romantic and quirky. Flower Boys Next Door, both main and second lead have quirks. 
Have you seen Falling for Innocence (its called Beating Again on Netflix)?  The male lead reminds me of the male leads in Fated to Love You and the Master's Son.  I highly recommend it.