Building a wall is like building a heart. Every time the plaster covering becomes thinner, the wrinkles of the old wall breathe out a little more; every step back in love, the young man's eyebrows become blurred. Ji Ning used ultra-thin craftsmanship to preserve the century-old texture of the streets, but found that the wall between herself and the sunken eaves, built of family grudges, was as thin as a cicada's wings but as solid as a rock - thin-layer repairs can only delay the weathering of the wall, and sincere accommodation can only suspend the estrangement in love. The scars on the old wall have been repaired smoothly, but the regrets of youth are like salt and frost in the cracks of bricks, which will eventually whiten and seep out on a southerly day.