[Hello, goodbye.] (홍이삭) Isaac Hong

Hello, goodbye. is a poignant ballad single by Isaac Hong, released on November 13, 2025, under Kakao Entertainment. Known for his introspective songwriting and emotive voice, Isaac delivers a delicate reflection on the fleeting nature of relationships—where every “hello” carries the seed of a “goodbye.” With gentle instrumentation and heartfelt lyrics, the song invites listeners into a quiet moment of vulnerability and grace. It’s a musical farewell wrapped in warmth, perfect for autumn’s introspective mood.