In the case of Korea, rather than finding the infected person in advance, the focus was on identifying and blocking the spread of the infected person. Therefore, Smart City Service checked the movement of the infected people by time, found close contacts in the vicinity, and took measures to self-quarantine immediately. As a result, the critical point of being identified before an infectious disease spreads was missed. However, Korea has prevented a rapid collapse of the medical system by slowing the rate of propagation around it, and the role of smart city services has been significant in this regard. We agree with the reviewers' opinion that the biggest cause of this COVID-19 transmission is the rapid spread of infected people around them by moving to public places before they show symptoms. Reflecting the reviewer's opinion that it is not clear, the entire sentence has been revised and translated clearly.
The contribution is a proposition of services such as screening people with thermal cameras and tracking infected people through CCTV. However, it misses a critical point of COVID. Infected people are in the public space without knowing that they have COVID, since contagion happens before symptoms appears. Once infected people have been identified, they are supposedly in quarantine. Do the authors propose to track everyone and then go back to the records of infected people to retrieve their paths and contacts? Or do the authors want to check if infected people are outside their home instead of in quarantine? This is not clear to me. Also, and more importantly, the integration and flexibility aspects are not really addressed in the end. The authors do not explain how the services they propose could be integrated with existing ones (e.g. which standards should be used) and how the services can be added or removed. This part is only represented as clouds in the proposed structure model but not discussed further. Therefore, it seems that the contribution breaks down to proposing strict tracking services which feasibility and acceptance by the population is not assessed.