Lin Ye, a rebellious teenager, struggles with low self-esteem because of his terrible grades and takes out all his resentment on his quiet, taciturn father, a maintenance worker. After leaving home on a rainy night, he unexpectedly discovers his father's long-hidden diary and learns that years ago, his father broke his back while rushing to save him from a dangerously high fever. The injury left him permanently disabled, yet he never uttered a single complaint. When his father is accidentally injured after his old wound flares up, Lin Ye finally understands the profound, silent love his father has always given him. He matures overnight, studies diligently, and eventually gets into a key high school, answering his father's lifelong protection and sacrifice with his own growth and sense of responsibility.