Drama as Romantic as Moon Embraces the Sun

Intense romance dramas where the ML and FL separate for a long time before meeting again (in most cases the ML falls for the FL before the separation, but his feelings are one-sided at that point):

• The Princess's Man - this one is fairly close to METS in terms of being a historical drama with political intrigue that pulls the main couple apart
• 100 Days My Prince
• Queen for Seven Days
• Come and Hug Me
• Just Between Lovers
• Thirty But Seventeen
• I Hear Your Voice
• The Legends
• It's Okay to Not Be Okay
• Goblin

Romances that are more comedic / not as melodramatic as the ones above but still involve pairs that separate for a long time before reuniting and becoming a cute couple:

• Weightlifting Fairy Kim Bok Joo
• My Secret Romance

Separated before either of them were old enough to have romantic feelings for each other but they were very close to one another:

• The Smile Has Left Your Eyes
  
• Healer
• Her Private Life

• Come and Hug me
• Just Between lovers
• When the Camellia blooms
• When my love blooms