"Good-Bye In Once Upon A Time" is a song by Eric Nam that reflects on the emotions and lingering feelings after a breakup. The lyrics express the narrator's longing to meet their ex-lover again and apologize for their past mistakes. The song starts with the narrator questioning if they will ever have a chance to meet their ex-lover again. They reflect on the passing time and wonder where their ex-lover might be at the moment. They also ponder if their ex-lover has moved on and found someone new, erasing all memories of their time together. The chorus highlights the narrator's inability to forget their ex-lover's smile, even though time has made it fade away. They hope that someday they will have the opportunity to see each other again and express their regrets and apologies for not being able to fully embrace their ex-lover's heart in the past. The second verse continues with the narrator expressing their ongoing dreams of reconnecting with their ex-lover. They believe that someday they might be able to reach a place where they can see each other again. The narrator wonders if they will be able to have a chance encounter and if their ex-lover will smile at them if it happens. Towards the end, the bridge reminisces about the beautiful memories shared by the narrator and their ex-lover. It assures that those memories will remain and will continue to shine upon them. The song concludes with the narrator saying goodbye and expressing their deep love for their ex-lover. Overall, "Good-Bye In Once Upon A Time" explores the lingering emotions and hopes of reconnecting with a past lover. It portrays the regret and longing experienced after a breakup while highlighting the impact that memories and time have on the feelings associated with a past relationship.