Romance between childhood friends (prepubescent specifically)

she was pretty

• All reply series (1997, 1994 and 1988) - always been together since childhood
• Pinocchio - has always been together since childhood
• I need romance 2
• I can hear your voice - first meet as children
• Blow Breeze - got separated at childhood
• Can you hear my heart - got separated at childhood
• My Love Eundong - got separated at childhood, meet as young adults and got separated again... then meet as adults
• Kill Me Heal me - got separated at childhood
• Jang Bori is here 
• Healer

also maybe check out historical dramas:

• Moon that Embraces the Sun
• Iljimae
• Yisan

+1 for:

• She Was Pretty*
• Pinocchio
• I Can Hear Your Voice
• Kill Me Heal Me*
• Healer*
• Hello Monster
• Attention, Love!*

And I'll add:

• Just Between Lovers*
• I Need Romance 3*
• Weightlifting Fairy Kim Bok Joo*
• While You Were Sleeping*
• Wednesday 3:30 PM
• W Two Worlds (this is a bit of a stretch - the FL created the ML when she was a kid)
• A Love So Beautiful
• The King's Woman*

* One or both of them do not remember their childhood connection in the beginning (in some cases because of amnesia or repressed memories) or they don't recognize the other person at first