잊지 마 is pronounced as 읻찌/이찌 마. However, because the second and subsequent syllables of a proper word is typically pronounced softer than the first syllable, 찌 might sound similar to 치, even though the only correct pronunciation is 찌. This type of hardening (making it tense, called 경음화) of a consonant due to interference results in the tensed pronunciation, like ㄲ, ㄸ, ㅃ, ㅆ, ㅉ, not the aspirated one ㅋ,ㅌ,ㅍ,ㅊ. The only time aspiration happens is when the consonant comes after a ㅎ, ㄶ, or ㅀ, as in 잃지 마 -> 일치 마, 닿다 -> 다타, 놓고 -> 노코, etc. This hardening most commonly happens when the ㄱ,ㄷ,and ㅂ group of consonants come in a sequence. When this happens, the first consonant degenerate to the representative sound of the group (ㄱ,ㄲ,ㅋ -> ㄱ; ㄷ,ㄸ,ㅌ,ㅅ,ㅆ,ㅈ,ㅉ,ㅊ -> ㄷ; ㅂ,ㅃ,ㅍ -> ㅂ), and the following consonant is pronounced tensed. * 각각 -> 각깍, 깎다 -> 깍따, 격발 -> 격빨, 극성 -> 극썽. * 딛고 -> 닫꼬, 믿다 -> 믿따, 햇살 -> 핻쌀, 헛짖 -> 헏찓. * 밥값 -> 밥깝, 밉다 -> 밉따, 밉보이다 -> 밉뽀이다, 밉살스럽다 -> 밉쌀스럽따, 삽질 -> 삽찔. * 젓갈 -> 젇깔, 삿대질 -> 삳때질, 숯불 -> 숟뿔, 닷새 -> 닫쌔. * 잊고 -> 읻꼬, 찾고 -> 찯꼬, 맞선 -> 맏썬, 잊지 -> 읻찌, * 꽃길 -> 꼳낄, 돛대 -> 돋때, 낯설다 -> 낟썰다, 내쫓지 마 -> 내쫃찌 마. * 부엌도 -> 부억또, 남녘 사람 -> 남녁싸람 * 같고 -> 갇꼬, 떠맡다 -> 떠맏따. 밑지다 -> 믿찌다. * 앞길 -> 압낄, 엎다 -> 업따, 앞바다 -> 압빠다, 잎사귀 -> 입싸귀. There are other cases of consonant hardening as well. * ㄱ,ㄷ,ㅅ,ㅈ after ㄴ,ㄵ,ㅁ,ㄻ: 껴안다 -> 껴안따, 앉고 -> 안꼬, 담고 -> 담꼬, 삶지 -> 삼찌. * ㄷ,ㅅ,ㅈ after ㄼ,ᆴ : 핥다 -> 할따, 떫지 -> 떨찌. * ㄱ, ㄷ, ㅂ, ㅅ, ㅈ after -(으)ㄹ: 할 것을 -> 할꺼슬, 갈 곳 -> 갈꼳. * ㄷ,ㅅ,ㅈ after ㄹ in a hanja(Chinese character) word: 절도 -> 절또, 물질 -> 물찔. * ㄱ, ㄷ, ㅂ, ㅅ, ㅈ at the start of a compound word: 산바람 -> 산빠람, 술잔 -> 술짠.