After the Snowmelt is a coming-of-age story about how teenagers confront the first intimate death of their lives.

On the threshold of adulthood, Yi-Shan's (director) best friend Chun, went trekking in Nepal with his boyfriend Yueh, promising to reunite with her there. However, she lost contact with them and didn't hear from them until 2 months later: they’d been trapped in a cave for 47 days due to unexpected snowfall. Chun passed away 3 days before the rescue, leaving Yueh as the sole survivor.

Yueh returns and reveals a promise made between him and Chun: the survivor must share their story. To honor Chun's last wish, Yi-Shan takes up the camera and accompanies Yueh to the mountains to ask about what happened in the cave. However, Yueh withdraws into silence, prompting her to retrace the journey she and Chun promised to take together.

Along her way, local villagers in Nepal share memories of Chun and Yueh. Gradually, her journey overlaps with theirs, blurring the boundary between past and present, and leading to the same destination. In the snowmelt season, some things resurface while others vanish forever. When Yi-Shan finally reaches the CAVE, she must confront the future alone.