士豪(林書函 飾)和美靜(吳靜依 飾)是兩個跨性別的高中生，他們在經歷一連串的痛苦後，決定相約離開人世，約定的那天來臨，兩人是否能順利一起離開呢？

After being through many tough situations in her life, Lin Mei-jing wrote this letter to Lin Hsih-hao. Even though they’re classmates, they are not familiar with each other at first. By a chance, she entered his secret shelter, after that, they started to share secrets and everything there. Today, they decided to leave the world together. This is a top secret plan. No one else knows it.