I recommend I Smile because I like the comforting atmosphere.

It is a song that warmly conveys the message to try smiling even when things are tough. It is extra special because, despite the bright melody, it evokes a touching emotion. The members' sincere voices feel like a great comfort. Listening to it makes me feel like the anxiety in my heart is gradually fading away. It warms me up enough to bring tears to my eyes when I listen to it at the end of a hard day. Every single lyric feels like it soothes the heart. It is a song that makes you feel hope even in the midst of sadness. It is a comforting song that I want to listen to for a long time.