Daewoo is not the only company where Indians control a stake in Pakistan but that is what is known as globalization in business.
That is the idea behind the whole peace and aman parade so that people can conduct business and provide jobs for those in need of it.
By that logic, the US which sold Pakistan 500 AMRAAM missiles and sophisticated jets is also proposing a century partnership, Hamdard Laboratories is split between India and Pakistan.
Joint Indian-Pakistani ventures arent a new thing nor are Indian investors in Pakistan. A Businessman will go where there is money to be made. The Israeli's were paid millions by Pakistan in the 90's for parts and electronic equipment.