When a love letter ends up in the wrong hands, it causes a bunch of youngsters to get into a lot of romantic hot water. The movie explores teenage crushes and misunderstandings in a lighthearted and entertaining way.
High school geek Ronald pays popular girl Cindy to pretend to be his girlfriend because he secretly admires her. Real feelings start to arise as they spend more time together, which makes their arrangement more difficult.
A young man is the object of a strange woman's covert admiration, and this infatuation drives her to act in ways that are more passionate and risky.
To lift Jean's spirits as a single mother, Holly creates a hidden admirer. There are poignant and funny moments as the fictitious admirer takes on a life of his own and things go out of control.
Business rivals Kathleen and Joe unintentionally start covert pen pals with anonymous emails. Their in-person interactions hamper their developing affection as their virtual relationship grows.
Longtime friends Rosie and Alex are secretly in love with one another. Their unspoken love causes them to miss out on many things and misunderstand each other, but their link never breaks.
When Lara Jean sends out her secret love letters to her crushes by mistake, it results in unforeseen romantic developments and a fictitious connection that becomes more genuine.