In the evening breeze in the high school playground, Su Tang's secret love note hidden in the exercise book turned into an unspoken secret during the graduation season. When reunion was expected, a car accident made Lin Wan stay at the age of twenty forever. From then on, Su Tang's years were filled with regretful love that sank into the deep sea.
Concept: - The purity and regret of youthful secret love: through "heartbeat in the exercise book" and "unhanded pink letterhead", the purity and caution of youthful secret love are delicately outlined. Those feelings hidden in the details have become an eternal secret due to graduation before they are revealed to the public, conveying the sadness of not being able to love in youth.