When using AI voice, we utilize TTS (Text-to-Speech) engines from external services (ElevenLabs, Voicemaker, Naver, etc.). In our experience, the engine continuously improves through learning, but sometimes errors may occur where it reads certain phrases strangely. When such cases are found, we provide feedback to the TTS service provider, but fixing AI implementation-specific errors is impossible. Instead, we work towards improvement through re-learning, which takes a considerable amount of time to process. The best solution is to quickly resolve the issue by modifying the problematic text into different characters to avoid the problem.