This study tests the existence of indirect effects of the KORUS FTA seasonal tariffs applied to U.S. oranges on domestic fruits and fruits shipped during the period when oranges are mainly imported(March to May). The empirical analysis is conducted using statistics on the shipment volume of fruits and fruits in the wholesale market, and the ANOVA analysis and post-tests are conducted by dividing the whole sample period into three subsample periods:before the FTA, the initial five years of the FTA, and the last five years of the FTA. Accoridng to the ANOVA analysis, it is primarily proved whether the shipping time changed before and after the FTA, and the Tukey Kramer method and Dunnett T3 post-test are conducted to verify the difference in shipping time among the three periods. In conclusion, it is confirmed that the shipment time of cherry tomatoes and Asian melons was delayed, and that the shipment time of strawberries and citrus fruits was adjusted earlier. In general, the distribution of the shipment period itself moved horizontally in all products, but the shipment period of cherry tomatoes increased further compared to before the FTA. Due to the simultaneous FTAs, the number of agricultural products imported only in certain seasons is expected to decrease. This means that the function and effect of seasonal tariffs, which have been effective so far, will be further reduced. Therefore, a partial reduction in tariffs or the TRQ provision may be the better concession strategy than seasonal tariffs in the future.