In the first half of 2025, China's cross-border e-commerce in the South Korean market has achieved remarkable results, with 70.83 million pieces of directly purchased goods, ranking first in South Korea's e-trade imports with a share of 77%, an increase of about three times compared with that of 2021. Relying on perfect manufacturing industry, cost-effective products and efficient logistics, China's cross-border e-commerce is rapidly rising, but it also faces a trust crisis with an increase of 21% in trademark infringement cases, a 746-fold increase in hazardous substances in children's products, and an increase of 56% in the number of complaints. This paper analyzes the advantages of its development, focuses on quality control and consumer rights protection countermeasures, and helps China's cross-border e-commerce realize sustainable development in the Korean market.