Childhood friends meet again as adults

So I realized lately I have a thing for this trope where characters who knew each other as children meet each other again as adults and their past relationship plays a large role in their current one. Examples include: 

• Just Between Lovers
• While You Were Sleeping
• Come and Hug Me
• What's Wrong With Secretary Kim? 
• A Korean Odyssey (not quiet the same feel are the others)

Okay I've realized most of these involve a shared childhood trauma that then affects their renewed adult relationship. I'm looking for more of the same. :D 

• Black
• Hello Monster
• Missing You (this is very similar to Come and Hug Me - wherein the main lead carries the guilt for causing the main female hardship and that's a big part of their interactions. Of course, Come and Hug Me is superior).  
  
• Radio Romance (the same actor even plays the "young male lead" role in both this drama and Come and Hug Me. The main leads are somewhat similar in personality as well).
• She Was Pretty (this is similar to What's Wrong with Secretary Kim. They even have the same male lead actor).
  
• Fight For My Way (though this is more like friends who become lovers, since they were never apart. The male just started liking the female lead as adults).
• Pinocchio (same as above, where they fall in love as adults but have been together since they were children).