I like how poignant Phono is.

It is a song that lingers in my heart even more because it has a calm yet somewhat melancholic atmosphere.
The members' emotional vocals blend well with the song's atmosphere, making me focus on the lyrics.
In the quiet parts, you can really feel the vocals' delicate emotions, so it is great to listen to with earphones.
The charm lies in the feeling that the lingering impression deepens the more you listen to it, rather than coming across strongly all at once.
This is a DAY6 song I would recommend when you want to listen to a sentimental song late at night.