Slums mostly shadow beautiful cities massive urbanization coupling is one of the biggest challenges for growing cities. Cites provide an attraction for people but this may open up to tragedy sometimes, trapping the dwellers in slums. Urban population is increasing drastically at the global level, half of the world’s population is living in urban areas. This huge increase in population proportionately involves rural to urban migration resulting formation of informal settlements or slums. Usually, these are densely populated areas established in or around the cities. Shadow traps more residents than its real city. Intellectual dissection of this problem makes elements of a well-planned city building responsible for nourishing this phenomenon. Pakistan is facing serious problems of slums, about 47.5% of the urban population of Pakistan was living in slums in 2005. This study highlighted the problem of slums in Pakistan and suggested policy recommendations for policymakers for future urbanization in Pakistan under CPEC. With the initiation of China Pakistan Economic Corridor (CPEC), it is expected to bring immense developments to Pakistan. CPEC is going to accelerate urbanization in Pakistan. Slum development should not be allowed to decelerate this development. For that comprehensive master planning of potential cities is required to cope the challenge of unplanned settlements.