A South Korea government official in charge of foreign exchange markets cautioned traders about pushing the won currency too low, highlighting the 1,200 level per dollar level as a key area to watch. "Market (investors) would be cautious near the 1,200 won level," a fx official told Reuters over the phone. The 1,200 mark has not been breached since March this year. The won is trading at about 18 month low per dollar.