There is a precise method for learning Korean.
Hangul is a scientifically created phonetic alphabet.
If you understand the principle, you can master it in 12 weeks.

King Sejong created Hangul and said, “A wise person can interpret it in half a day, and a fool can learn it in ten days.”
Because Hangul is a simple symbol created to express the sounds of our language.
If you learn the principles of creation at the right time, you can achieve it very easily.
Therefore, [12 weeks of Korean] should be started after the age of 4 when the child has learned the sounds of speech.
First, you need to be able to see an apple and say 'apple'.
Only then can you write the letter 'apple' with the meaning you know by combining the consonants and vowels that correspond to the sound.
Hangul, the Korean alphabet, is scientifically created with precision and is easier to learn than any other alphabet in the world. 12 weeks is enough.