South Korea’s Daily Coronavirus Infection Numbers Drops to Double Digits for Six Straight Days
Apparently the long holiday weekend which led to less testing is what may have caused this drop:

South Korea’s new coronavirus cases stayed below 100 for the sixth straight day Tuesday, but the country is bracing for a possible resurgence in new infections after a long holiday, as a slew of sporadic clusters were reported.
The country added 75 more COVID-19 cases, including 66 local infections, raising the total caseload to 24,239, according to the Korea Disease Control and Prevention Agency (KDCA).
It marked a slight rise from 73 posted on Monday and 64 cases reported on Sunday.
After daily infections hit 133 on Wednesday last week, they have been in double-digit figures. The drop was in part attributed to fewer tests carried out over the five-day Chuseok holiday that ran through Sunday.
Yonhap
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