 Prudential Financial Inc, the No. 1 U.S. life insurer, has hired Goldman Sachs to explore the possibility of selling its South Korean unit, which could fetch about 2 trillion won 1.70 billion, Korea Economic Daily reported. A sale of the unit would see the U.S. insurer exit the South Korean market after about 30 years since it first entered. South Koreas large financial firms like KB Financial Group and Woori Financial Group, as well as private equity funds are named as potential buyers of the insurer, the report said. 