1. Statistics Korea, April 2021 Online shopping trends reports for the Republic of Korea. https://kostat.go.kr/portal/korea/kor_nw/1/12/3/index.board?bmode=read&bSeq=&aSeq=389994&pageNo=1&rowNum=10&navCount=10&currPg=&searchInfo=&sTarget=title&sTxt=,2021 (accessed 31 December 2021).
2. Gaging customer response to dawn delivery service using social big data;Uatay;Culinary Sci. Hospital. Res.,2020
3. Current state, problems and promotion of coupang;Seo;J. Econ. Market. Manag.,2018
4. Before sunrise: fresh grocery food delivered by market Kurly;Kim;J. Inf. Oper. Manag.,2019
5. FedEx. Refrigerated and cold shipping. https://www.fedex.com/en-us/shipping/temperature-control/refrigerated-cold-shipping.html (accessed 31 December 2021).