Something like Scarlet heart ryeo, Goblin, My mister. 

Daring Women
Family's Honor (2nd couple)

 try:

  • Marriage Contract
  • The Spring Day of My Life
  • Mr. Sunshine 
  • Ngao Asoke
  • Doctors
  • Story Of Yanxi Palace
  • Sweet 18 (romcom) 
  • The Eccentric daughter in law (romcom) 
  • Love Song
  • Movies:
    • MY Teacher
    • Innocent Steps
    • My Little Bride
    • Close range love

Guardian: The Lonely and Great God

Black(although the love scenes are very less)

 AnonymousPenguin27:

How is Korean Odyssey an age gap?

He is an extremely powerful immortal being, and the female lead is human. They met when she was a child, and years later when she's older he still looks the same. So in the story they have an age gap.

Does it include supernatural beings that are hundreds of years old but look the same age? :)