My Missing Valentine (Chinese: 消失的情人節) is a 2020 Taiwanese romantic comedy film written and directed by Chen Yu-hsun, and starring Liu Kuan-ting, Patty Lee.

[4][5] It received 11 nominations at the 57th Golden Horse Awards, winning Best Feature Film, Best Original Screenplay, Best Visual Effects, Best Film Editing and Best Director for Chen.

[6] A girl who does things so quickly that she's always one step ahead of others discovers that her Valentine's Day has mysteriously passed when she wakes up the next morning.

My Missing Valentine was remade in Japan as One Second Ahead, One Second Behind in 2023, with the genders of the protagonists reversed.

It was adapted by Kankurō Kudō and directed by Nobuhiro Yamashita.