I Am the Secret in Your Heart (Chinese: 夏日的檸檬草) is a 2024 Taiwanese romance film directed and written by Lai Meng-chieh.

It centers around an ordinary schoolgirl (Lee) who finds herself in a love triangle between a newly transferred student (Tsao) and her childhood friend (Lo).

As Cheng carries her to the hospital, he notices a scar on Wang's forehead that resembles one from a girl who once saved him from bullies in his childhood.

Seeking comfort, Wang spends time with Yuzu, who skips class for a fun day at the arcade.

Worse still, Cheng's mother confronts him about sneaking back to their rural town, insisting he return to the United States.

As time passes, Wang and Cheng keep in touch through video calls during significant life events, but their conversations grow stale and eventually drift apart.

[3] I Am the Secret in Your Heart was adapted from a romance web novel of the same name written by Macchiato and published on the Taiwanese forum Popo.

[9] Director Lai Meng-chieh joined the project after winning a Golden Bell Award for Mad Doctor (2022),[10] and Moon Lee, Tsao Yu-ning, and Shou Lo were announced as the lead actors in August 2023.

[12] A spin-off short story titled Ten Years was released alongside the tenth-anniversary reprint edition of the novel in 2024, with some of its content also incorporated into the film.

[20][21] The film's theme song, "Heedless," was composed by End Chung, with lyrics written by him and performed by Shou Lo.

[32] Jonathan Hung of am730 described the film as a delightful addition to Taiwan's coming-of-age romance genre, following the commercial success of You Are the Apple of My Eye (2011), noting that it appeals to young audiences with its familiar yet romantic themes while effectively capturing the essence of unspoken love.