And They Were *SURPRISE* Childhood Friends

Neither is aware. Revealed to MCs.

Main characters fall in love as children, but are seperated when FL has to pretend to be her twin brother. Served as a theme and secret throughout. Used to explain why ML falls in love with FL despite class differences and the belief that she is a man.

Neither is aware. Quickly,  revealed to MCs.

Although quickly acknowledged by both, they didn't realize they met first as children at Prem's Grandmother's resturant.

Neither is aware. Quickly, revealed to MCs.

Neither is aware.

FL saved ML in high school. ML does't immediately recognize her and FL doesn't make the connection.

Neither are aware. Revealed to MCs.

Main characters parents were friends and they were childhood friends. However, FL loses her memories and ML doesn't make the connection. Parent's backstory and their bond is used as a driving force for the story and romance.

Neither are aware. Not revealed to MCs.

Main characters met as children in their first life. Neither are aware. Used to make up for the misdirection(SPOILER, IF YOU KNOW, YOU KNOW) and establish "fated lovers" trope.

Only one is aware.

Less of childhood friends, but more of FL lead met ML when he was a child. ML realizes the connection eventually during the show.

Neither are aware. Revealed to MCs.

Main characters live next to each other exchanging notes and messages of encouragement without knowing each other's identities. Used to establish more romance especially considering the soulmate concept of the show. Deeper use than most on this list as it connects to both of character's struggles and growth.

Only one is aware. Revealed to MCs.

Main characters were childhood best friends as they get older they become estranged. When they meet again only one of them is aware. Major plotline as some deception was used and lack of communication.

Neither is aware. Quickly, revealed to MCs.

Only one is aware. Revealed to MCs.

Main characters meet as teenager and child, respectively. Younger character remembers and older character does not recognize him.

Only one is aware. Revealed to MC.

Main character forgets his childhood memories and when they first met. Used to establish tension and stakes between MLs. 

Only one is aware. Not revealed to MC.

One of the main characters had a crush on the other in high school. Only one is aware.

Only one is aware. Revealed to MCs.

FL remembers past life where they were childhood friends. Used a driving force for the plot and is the whole motivation for romance and FL's actions

Neither is aware. Quickly, revealed to MCs.

Main leads met as children when Tharn saved Phaya from drowning. This is also implied as a destined meeting.

Only one is aware. Revealed to MCs.

FL and her "love interest" met as children in her first life. Love interest has no memory of their first life. One of my favorite uses of the trope. While they met as children in their first life, they proceed to get married as adults. Show is not really a romance, but their episode of their past life is both heartbreaking and heartwarming. Decided to include this because the love interest lost the memory of it.

Neither is aware. Revealed to MCs.

Met as children and one male lead saved the other from drowning.

Only one is aware. Revealed to MCs.

FL lead is aware, but ML is not. Trope is used to establish tension as ML has a grudge against her hidden idenity.

One is not aware. Revealed to MCs.

Major storyline is their connection in childhood as they promised to marry eachother. FL is not aware of her childhood friend's idenity. Used for dramatic effect and to drive "fated romance" trope.

Neither are aware.  Not revealed to MCs.

Main characters meet as babies. Used to highlight the hypocrisy of the societal standards that is the main obstacle to the romance.

Neither is aware.

Meet as children at a funeral home. Used to explain fortune telling mechanism in the story.