“Beijing has inveighed against the deployment and criticized the South Korean government for undermining bilateral relations by hosting the missile system.
Chinese citizens, among whom a sense of nationalism is strong, have also taken up the anti-THAAD mantle, protesting and boycotting South Korean businesses and tourism.
Several Chinese state-run media outlets have called for organized voluntary boycotts of South Korean businesses and imports. China is Seoul’s largest trading partner, receiving one-quarter of South Korea’s exports.” http://www.businessinsider.com/china-south-korea-economic-boycott-protests-over-thaad-missile-system-2017-3