USD/KRW rose 1.0292 to 1,339.94, a won weakness of more than 1% in a day; over the same session USD/JPY at 158.17 also saw a softer yen, while USD/CNY at 6.6661 showed a stronger yuan. With three Northeast Asian currencies diverging, Korean refiners' dollar-denominated crude books and Busan's relative bunkering edge need a fresh calculation.