According to CoinMeta, South Korea’s foreign exchange authorities carried out a rare intervention to sell dollars on Thursday, pushing the won to a nine-month high. The won appreciated by 2% against the dollar on Thursday, reaching 1,418.0 won per dollar, the strongest level since October 20 last year. The won hit a 17-year low of 1,561.50 last month and has risen by more than 8% this month, with the potential to record the largest monthly increase since March 2009. Market sources revealed that the intervention actions by South Korea and Japan were carried out simultaneously, leading the market to suspect that the two countries conducted joint intervention.