This study concluded the same conclusion through an mixed methodology that simultaneously conducts qualitative and quantitative research based on the interview data of people doing small and parcel trade between Korea and China. In the process of amplifying the data, there was a theoretical contribution to reestablish the theory of the usefulness of mixed methodology in the field of trade using the bootstrap, which is one of the machine learning techniques. In addition, Korea's THAAD deployment and China's trade retaliation reduced overall small and parcel trade activity, but also proved that sales volume and velocity in Korea for Chinese goods did not much decrease. This study has limitations that it can not contact various parcel traders other than Korean-Chinese due to the specificity of the occupation group, but it is expected that more sophisticated research will be possible in the future.