If you test positive for COVID-19, but it is due to an old infection
If your pre-departure test is positive, but you believe this is because of a historical COVID-19 infection, you need to see a medical practitioner who will examine you for current symptoms of COVID-19.
If they are confident you do not currently have a COVID-19 infection, you will need them to provide:
a medical certificate with the date of your previous positive test, within 48 hours of your first international flight and
documentation stating that they consider you as no longer being infectious with COVID-19.
If you have tested positive for COVID-19 in the last 3 months, book your medical examination in advance of receiving your test results.
You should also check with your airlines about any regulations they may have in place regarding past COVID-19 infections.
You are still required to provide a current valid pre-departure test if you have recovered from COVID-19.
라고 ministry of health에 적혀있네요 최근에 완치되신거라 테스트는 계속 양성이 뜰거기 때문에 완치증명서 떼고 오시면 될거같네요