The Vow is about the love of two characters Paige and Leo. The two decided to have a "secret" wedding in a museum to save money. However, when they were enjoying the first happy days of their married life, an incident happened. A tragic car accident robbed Paige of her memory. When she woke up in the hospital, she no longer remembered who Leo was, but only remembered the time before she met and fell in love with him. Things got complicated when Paige returned to her ex-lover. Leo told himself that he had to do everything to win back his wife's heart...