When he was seven years old, Su Mingchao's mother broke a green bottle and left home. Since then, he has developed a habit of walking with his head down and picking up sea glass.
When he was in high school, class monitor Xu Tinglan knelt down and said to him, "Be careful with that one that pricks your hand." From then on, he sent her a piece of polished sea glass every birthday, anonymously, for ten years. He spent ten years piecing together her portrait with broken glass in a seaside lighthouse. He died in a tide - he was trying to pick out a piece of glass and got stuck in a crack in the rocks without having time to run.
Concept: Some people's love is unspoken throughout their lives. It is not magnificent or earth-shattering, it just exists quietly.