Yu Chengxin is the only remaining retro hurdy-gurdy reed resonance gap adjustment designer in China. She relied on a feeler gauge and a pair of ears to make a living. She could distinguish the change in timbre caused by a gap difference of 0.01 Mm, but she could not tell why she ran away ten years ago. Lin Jianshen, the third generation heir to the "Old Time" piano shop, passed the professional performance level 8 exam, but has never played a complete piece of music. Ten years later, an old German organ from 1903 dragged them back to the same room. If the gap between the reeds is too small, the sound will be harsh, and if the gap is too large, the rhythm will be loose - just like the distance between them can never be adjusted correctly. Yu Chengxin knows better than anyone else: a permanently misaligned reed can never be adjusted back to its original state. Once some wear and tear occurs, it will be like some words left unsaid, and it will never return to sincerity. But the second the feeler probed into the metal gap, she heard not only the pitch, but also the murmur of two hearts resonating in ten years of silence.
