"Happy Birthday" by UP10TION is a lively and upbeat song about celebrating someone's birthday and expressing love and joy. The lyrics convey the excitement and happiness surrounding a special day, where the narrator wishes to make the birthday person feel cherished and loved. The song starts by acknowledging someone's presence and saying goodbye to any negative feelings. The narrator declares that they will endure anything for the person they care about. Throughout the song, they emphasize the desire to make the birthday person happy and create precious memories together. The chorus compares the feeling of celebrating a birthday to the pleasure of lighting a candle and the warmth it brings. It signifies the significance and brightness of the day. The lyrics also express the narrator's intentions to be present and make the birthday person's day special. The pre-chorus and bridge sections express the narrator's determination to make the day perfect and create a memorable experience. They mention popping champagne, partying every day, and wanting to be by the birthday person's side. The lyrics highlight the importance of joy and love in their relationship. Overall, "Happy Birthday" is a joyful and catchy song that celebrates a special day and expresses love and happiness. It encourages enjoying the moment and creating beautiful memories together.