South Korea's daily new coronavirus cases fell back to below 1,500 on Monday on fewer tests over the weekend as the country has extended its highest virus rules for another two weeks due to relentless spread of the virus.

The country added 1,492 COVID-19 cases, including 1,455 local infections, raising the total caseload to 212,448, according to the Korea Disease Control and Prevention Agency (KDCA).

The latest caseload was down 237 from 1,729 the previous day, falling below the 1,700s for the first time since Wednesday.

The country added four more deaths from COVID-19, raising the death toll to 2,125.

Health authorities decided to extend the Level 4 distancing measures, the highest in the country's four-tier system, for the greater Seoul area until Aug. 22, with other areas remaining under Level 3.

The Level 4 restrictions ban gatherings of more than two people after 6 p.m., place a 10 p.m. curfew on restaurants and cafes, and suspend the operations of nightclubs and other entertainment venues.

The country's second largest city of Busan will raise its distancing rules to the toughest level from Tuesday until Aug. 22 as new infections have soared in the city in recent weeks.

The move came amid concerns over the fast spread of the virus during the Liberation Day holiday from Saturday to next Monday and the start of half school semesters later this month. Liberation Day falls on Sunday, which marks Korea's liberation from Japan's 1910-1945 colonial rule.

The country's fourth wave of the COVID-19 pandemic began to ravage the greater Seoul area in early July and has expanded to other areas, with daily cases staying above 1,000 for 34 days.

Since the country kicked off its vaccination program in late February, a total of 20.93 million people, or 40.8 percent of the country's 51.3 million population, have received their first shots of COVID-19 vaccines.

Around 15 percent, or 7.71 million people, have been fully vaccinated, according to KDCA data.

The country aims to administer a single vaccination shot to 36 million people, or 70 percent of its population, by September with hopes of reaching herd immunity in November.

Advance reservations for vaccinations for people aged 18 to 49, estimated at some 16 million, starts on Monday.

Of the locally transmitted cases, 414 were reported in Seoul, with the surrounding Gyeonggi Province adding 402, and the western port city of Incheon confirming 65 more new cases.

The southeastern port city of Busan posted 121 new cases, while neighboring South Gyeongsang Province reported 87 more infections.

There were 37 cases from overseas arrivals, which include South Korean nationals.

The total number of people released from quarantine after making full recoveries was 186,242, up 1,239 from a day earlier. (Yonhap)