When or ㅌ is followed by the vowel ㅣ , they change into ㅈ or ㅊ . ㄷ + 이 → [지] (e.g., 굳이 → [구지] ) ㅌ + 이 → [치] (e.g., 같이 → [가치] )
Here is the letter, and the rules he follows, step by step. Hangul- Full List of Reading Rules in Korean
If you have started learning Korean, you already know that Hangul (한글) is scientifically one of the most logical alphabets in the world. You can learn the basic consonants and vowels in an afternoon. However, the relief of mastering the alphabet quickly fades when you open a Korean book or look at a menu. Why is 감사합니다 pronounced "Kamsa-hamnida" instead of "Kamsa-hamnida" (wait, where did the 'b' go?)? When or ㅌ is followed by the vowel