The negative assessment on Yoon's conduct of state affairs made no change at 58 percent, according to the local pollster Gallup Korea.
Support for the ruling conservative People Power Party advanced 3 percentage points over the week to 37 percent this week.
The main liberal opposition Democratic Party's popularity rating slipped 4 percentage points to 29 percent.
The minor left-leaning Rebuilding Korea Party posted 12 percent of support score this week, while the minor center-right Reform Party logged 3 percent of approval score.
The results were based on a survey of 1,001 voters conducted from Tuesday to Thursday. It had plus and minus 3.1 percentage points in margin of error with a 95-percent confidence level.
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