스터디버디：AI를 활용한 효율적인 학습, 검출되지 않는 은밀한 어시스턴트。 Note: The phrase "은밀한 어시스턴트" is a direct translation of "隐形助手" but it's worth noting that in Korean, this phrase might not convey the exact meaning intended by "隐形助手" as it implies something more covert or hidden. If the intention was to imply an assistant that is always available without being intrusive, a different phrasing might be more appropriate. However, following the instructions strictly, this is the translation provided.