As of Sunday, South Korean quarantine authorities have confirmed at least 225 confirmed COVID-19 cases in relation to the Itaewon club cluster infection.
96 were in the club at the time, while the other 129 are contacts, including family members or colleagues.
"Breaking the chain of transmission is deemed crucial right now as we witness the continued spread of the virus as a result of the Itaewon club cluster infection."
Quarantine authorities have confirmed there are even people who have caught the virus sixth-hand.
To better track down potential coronavirus-infected patients, the South Korean government has rolled out plans to require high-risk entertainment establishments such as clubs and bars to use a quick response, or QR code-based visitor register.
This has been designed to prevent a second Itaewon cluster infection, where many club visitors submitted false personal information.
With the new system, one's personal information, including name, contact number and time of entry to facilities will be stored in an encrypted form before the quarantine authorities can access them.
Such information will be deleted automatically after 4 weeks.
"One's personal information encrypted in the QR code will be stored in the encrypted format at the institutions that issue the QR codes. All detailed records will be stored separately by a third institution."
The system will be implemented from mid-June, being mandatory for all establishments that have been subject to the gathering ban issued by local governments.
It will remain in place when the infectious disease alert level is at "serious" or "cautionary."
Kim Hyo-sun, Arirang News.