If you use other apps and watch smartphone, you can always study Korean.
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When you turn the screen off and on again, the words on the screen will continue to sound as you can see in the screenshots.
You can set the location where you want the message to appear, and you can also set the font size.
In the learning mode, words that are marked as complete memorization can be studied efficiently by preventing them from reappearing in the toast message or learning mode.
Basic 1,588 words / Middle school 3,413 words
High school 6,260 words / University 11,298 words
TOEIC 7,157 words / TOEFL 9,187 words
Civil servants 10,010 words / Advanced 2,318 words
14,257 words without foundation integration