POSCO is facing the prospect of a prolonged labor dispute after union members rejected a tentative wage agreement, leaving the steelmaker struggling to reach a deal following the first strike in its history. The company’s labor union on Sunday said its members had rejected the tentative wage agreement in a vote. Of the 9,177 ballots cast, 4,433 votes, or 48.31 percent, were in favor, while 4,744, or 51.7 percent, were against. The rejection has cast uncertainty over the next round of negotiations, with the union expected to seek better terms than those included in the failed deal. However, it remains unclear how much management will be willing to concede amid a prolonged downturn in the steel industry. The two sides began wage negotiations on June 16 and held around 30 rounds of formal and working-level talks, but failed to narrow their differences over pay increases and other compensation. The union had initially called for a 7.1 percent increase in base pay, a performance bonus worth 600 percent of base pay, 50 shares of company stock for each worker and a holiday bonus worth 200 per