This has the potential to turn into a much larger outbreak if these people were not wearing masks and social distancing while infected:

At least 11 employees at a local fast-food franchise have tested positive for the new coronavirus, officials said Wednesday, raising concerns over a possibly bigger outbreak.
Ten employees of Lotteria were found to have had a meetiing at the franchise restaurant near Gunja subway station in the eastern Seoul ward of Gwangjin between 3:18 and 5:25 p.m. on Aug. 6, according to health authorities and the Seoul city government.
They later visited two other restaurants in the area, with nine more people joining them.
An employee who lives in Goyang, Gyeonggi Province, first tested positive on Tuesday, and three others, all Seoul residents, also tested positive on the same day.
Additional infections were reported on Wednesday, bringing the number of cases to 11 as of 6 p.m.
Yonhap
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