"One Fine Day" by Jung Yong Hwa is a sentimental ballad that expresses the nostalgia and longing for a past relationship. The song reminisces about beautiful memories shared with a loved one, highlighting the happiness and warmth that was felt during that time. The lyrics depict the desire to go back to those moments and the pain of not being able to relive them. The song also talks about the sadness of growing apart and not being able to hold onto precious memories. It reflects on how even if the other person forgets, the singer will still vividly remember and cherish the love they shared. The lyrics convey a sense of longing and a deep emotional connection to the past. Overall, "One Fine Day" evokes feelings of bittersweet nostalgia, emphasizing the preciousness of love and the impact it has on our lives, even long after it's gone.