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Two more people in Korea were confirmed to be infected with the mutant coronavirus, which was first confirmed in the UK.
Combined with the three other family members who had previously come from England, there have been a total of five infected so far.
Authorities are scrutinizing family members and contacts of infected people to prevent spread to the community.
This is reporter Kim Hye-young.
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Additional confirmed mutant virus infections are men in their 80s and women in their 20s.
A man in his 80s entered the UK on the 13th with two family members.
Afterwards, he was quarantined at an officetel in Goyang-si, Gyeonggi-do, but he collapsed in the corridor of the officetel on the 26th and was moved to a hospital and died.
The quarantine authorities say they have identified a British mutant virus in a full-length genome test of a man who died.
Three members of the man's family were also tested positive for COVID-19, and are currently being checked for mutant virus.
In particular, one of them is known to have visited hospitals, beauty salons, and marts in Ilsandong-gu, Goyang-si, after returning to Korea first on the 8th of last month and being removed from self-isolation.
Fourteen people, including neighbors and paramedics, who came into contact with this family tested negative on the first screening and are now waiting for the results of the second test.
Another confirmed mutant virus was a woman in her twenties who arrived from the UK through Dubai on the 24th.
This woman is currently being quarantined at the Life Therapy Center.
[Won-Seok Choi/Professor, Department of Infectious Medicine, Ansan Hospital, Korea University: If the infectious power of (mutant virus) is high, it will cause many patients by itself, and there is a possibility that it may not be more controlled. I think it will.]
Experts are advising that the scope of monitoring should be further expanded at the moment to prevent further spread of the mutant virus.
(Video editing: Jihye So, VJ: Soyoung Shin, CG: Seunghyun Seo)