South Korean burger chain Mom’s Touch is once again up for sale, industry officials said Sunday, roughly four years after its private equity owner shelved an earlier attempt to sell the company. KL & Partners, which controls the franchise through a special-purpose vehicle, plans to appoint a financial adviser as early as April and aims to complete the sale by the end of the year, according to the sources. The firm is seeking a valuation above 1 trillion won (about $665 million). KL & Partners ac