This paper analyzes the impact of the Chile-South Korea Free Trade Agreement (CKFTA) over the bilateral extensive and intensive margins of trade. Using disaggregated product-level data for the period 1996-2017, the paper tests the impact of CKFTA on bilateral flows, as well as differentiate these effects between intensive and extensive margins at the product level. To estimate, a Poisson-Pseudo Maximum Likelihood model is proposed. It is found that the CKFTA had a positive effect over bilateral trade flows, and although new products were added to the bilateral export basket (extensive margin), the impact is stronger on goods already traded (intensive margin). Moreover, the paper concludes that this effect is stronger for Chilean exports.