Just as Guai, a bicycle messenger, makes his final payment for the silver mountain bike loaned by his company, he finds it stolen. After endless searching, Guai discovers his bicycle is now in the hands of Jian who bought the bicycle with stolen money. Though Guai and Jian finally work out a deal, they find themselves involved in a series of unforgetable events.

Lara Jean has never openly admitted her crushes. Instead, she wrote each boy a letter about how she felt, sealed it, and hid it in a box under her bed. But one day Lara Jean discovers that somehow her secret box of letters has been mailed, causing all her crushes from her past to confront her about the letters: her first kiss, the boy from summer camp, even her sister's ex-boyfriend, Josh. As she learns to deal with her past loves face to face, Lara...