The largest of three labor unions at Seoul Metro threatened Tuesday to launch a general strike on Nov. 25 unless its demands, including additional staff recruitment and wage increases, are met. Union 1 of Seoul Metro, which operates subway Lines 1-8 and parts of Line 9, issued the warning at a news conference following a meeting of senior union members. The union initially sought a 5.2 percent wage increase but lowered its demand to 3.5 percent in negotiations with management. It also calls for scrapping a plan to cut 2,212 jobs and hiring an additional 1,313 workers this year to address staff shortages. Other demands include state funding for public services and a requirement that all field work be performed by two-person teams. The union said 7,782, or 84.6 percent, of its 9,201 members recently participated in a vote, with 6,715, or 86.3 percent of those who voted, backing the strike plan. Unions 2 and 3 also approved the strike plan, with 80.8 percent and 94.9 percent of their respective members voting in favor. Union 1 said it and Union 2 plan to launch a "work-to-rule" campaign on N