I made this because I didn't want to spend 20,000 won per month on Malhaeoboca. I selected intermediate-level and above words from the Oxford 5000 word set created by Oxford University. You can look at English meanings and example sentences for words and fill in the blanks.

An algorithm adjusts the review cycle based on whether you get answers right or wrong, and you can also see hints. I use it with the goal of getting 10 correct answers a day.

You can sign up at the link below to try it out. If you have any questions, please email me at me@han-park.info (Jonghan Park).