SEOUL, Jan 15 : U.S. Treasury Secretary Scott Bessent's recent comments on the Korean won underscore the importance of foreign exchange stability for bilateral economic cooperation between Seoul and Washington, a senior South Korean official said on Thursday. Deputy Finance Minister Choi Ji-young said currency stability was an important factor because volatility could hinder progress on a $350 billion U.S. investment pledged by the Asian country. Bessent said on Wednesday he had discussed the