I recommend Letting Go because I like the sentimental atmosphere.

It is a breakup song that starts quietly and slowly stirs your emotions. The atmosphere of calmly accepting the breakup makes it feel even sadder. DAY6 The unique and delicate expression of emotions is truly outstanding. The melody is gentle, making it a perfect match for the nighttime mood. As you listen, past memories naturally come to mind. It is a song where quiet sadness resonates more deeply than loud crying. It leaves a lasting impression and is not easily forgotten. If you like emotional ballads, I highly recommend this.