Shiyue and Qi Jingyuan have been known to the whole school as "rivals" since middle school: she is a stubborn girl from a poor family who ranks second in grade, and he is an arrogant and noble boy who is always ranked first. They bickered with each other in debates, competed at sports events, and even quarreled when they bumped into each other on the way home from school. However, during a power outage at the cram school on a rainy night in the senior year of high school, they discovered for the first time the softness hidden under the edge of each other.
After graduation, the two entered the same industry by accident. During the workplace confrontation, Shiyue gradually discovered the reliability behind Qi Jingyuan's venomous tongue - he would silently help her solve customers' difficulties, and would also deliver hot porridge to her when she worked overtime until early in the morning. Qi Jingyuan, on the other hand, was struck by Shiyue's tenacity and tenderness during the "forced" cooperations. He changed from "not liking her" to "not liking her even more when she was chased by others".
When the ambiguity spreads in the late night office lights, a drunken confession finally breaks the window paper. From renting together to getting married, from morning sickness during pregnancy to disagreements over parenting, they struggled with mortgage pressure, misunderstandings between mother-in-law and daughter-in-law, and the balance between work and family. However, they always remembered the afternoon when they shared headphones in middle school, and the three o'clock in the morning when they first entered society and supported each other.
Thirty years have passed, and the former rivals have become each other's most solid support. When Qi Jingyuan, who had slightly white temples, opened the yellowed classmate book on his golden wedding anniversary, next to the words "Qi Jingyuan is a big idiot" written angrily by Shi Yue on the title page, there was already a line of small words: "But he is also my favorite big idiot."
