There was no way Lee Jae-myung was going to keep such a high popularity rating. Like all other ROK presidents before him his approval rating is beginning to slide the longer he is in office:

President Lee Jae Myung’s approval rating slid for the first time since his inauguration in June after rising for five consecutive weeks, a survey showed Monday.
According to the survey by Realmeter and commissioned by a local news outlet, positive assessment of Lee’s performance fell 2.4 percentage points to 62.2 percent from the previous week, while negative assessment rose 2.3 percentage points to 32.3 percent.
The pollster said controversies surrounding ministerial nominees during last week’s confirmation hearings and damage from the recent torrential rains appear to have negatively affected the approval ratings.
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