1. Varying four-character idiom vocabulary by level (around 22,000 words)
- Easily understandable words with explains and examples.
- Writing functions

2. Expect learning effects using various functions
- Learning : Recurrent learning, writing, and listening functions
- Word quiz : problem-solving four-character idiom quiz
- Word chain : New concept word chain using four character idioms

3. Key Features
- Daily learning : word learning function once a day
- You can search even if you don't have an internet connection.
- Check function to collect difficult words and study them separately.

We invite you to an interesting world of 4 character idioms.
Have fun learning words through quiz, word chain, idiom game, etc.
If you learn one word a day, you will improve your 4 character idioms skills.