"Day & Night" is a song by Jung Seung Hwan, a South Korean singer. The song reflects on the emotions and experiences of a person who has gone through a journey of longing and pain. The lyrics describe a bright light shining into the protagonist's dark world, symbolizing the coming of a special person into their life. The song questions whether this person understands the impact they have had on the protagonist's life and whether they are aware of their importance. The chorus emphasizes the longing to hold this person tight and be the one who comforts them on their hard days. The protagonist wishes to be the one who provides solace and respite from their weary days. The song also touches upon moments of sadness and depression that the protagonist has experienced, where they couldn't express their emotions to anyone else. The rain falling in their heart symbolizes the pain they have endured. The lyrics express the hope that the person they long for understands and acknowledges the struggles they have gone through. The lyrics further illustrate the protagonist's dream of losing the person they love, which causes them to wake up feeling a deep sense of sadness. The song conveys the ache in their heart caused by the fear of losing this person. Throughout the song, there is a desire for this person to recognize and appreciate the love and understanding the protagonist has given them. The lyrics convey the hope that the person they love will understand and support them, even in their darkest moments. Overall, "Day & Night" explores themes of yearning, pain, and the longing for emotional connection.