With the rising of dense and cold high buildings in the city, happiness is being broken into pieces and drifting away in the congested traffic and the foul air.

With cold-faced high-rise buildings mushrooming, amid a congested traffic, breathing smog-polluted air, slowly our familiar contentment shatters, the broken pieces drifting away and vanishing.

The congested traffic has become a serious problem for many cities with their steadily increasing population, and the construction of subways is viewed as an effective solution to the problem.