"D-Day" (디데이) by Jung Seung Hwan is a heartfelt Korean ballad that tells the story of someone who feels like they are about to fly away because they are overwhelmed with happiness. The lyrics describe the feeling of lightness and the sense of being uplifted, as if they are floating in the air. The person finds it hard to believe this is real, but they are experiencing a newfound happiness that they can't contain. The song reflects on the idea that dreams can come true and that the day when you truly achieve your dreams will come. It suggests that the accumulation of small fortunate events can lead to something meaningful, like the gift of meeting someone special. The narrator expresses how they feel content and fulfilled, feeling as though they have achieved everything they wanted in life. They feel that they can't ask for anything more because they have the most perfect world. However, the overwhelming beauty of their world becomes too much for them to handle, and they struggle to bear the intensity of their emotions. Despite feeling complete, the narrator insists that they want to fall in love with the person they are singing to every day. They have confidence in themselves, knowing that their current state will not change, reassuring their loved one that their choice is the right one. The song appreciates the person who has been patient and understanding. It suggests that both the narrator and the person they are singing to have taken their time to grow in each other's hearts. The lyrics also express a desire to know when exactly the person entered the narrator's heart, even if it means staying up all night talking about it. The narrator reaffirms that they have achieved everything they desired and can't ask for more. However, the intense beauty of their world still blinds them, making it hard to endure. They promise to look into their loved one's eyes and tell them that they were happy even when they loved themselves. The song acknowledges that they didn't fully understand themselves before but now that they are together, they will see and learn new things about themselves. They believe that their imperfections fit perfectly together, and they encourage their loved one not to worry about anything. The narrator promises to support their loved one even if they are at the end of the world, becoming their ally. They assure their loved one that even if they can't see it, they will remain unbroken like a big circle, ready to embrace and comfort them. Overall, "D-Day" is a beautiful and emotional song about finding and cherishing true happiness, appreciating the journey, and being grateful for the person who completes your world.