This speech challenges the common belief that forgetting is inherently bad, arguing instead that forgetting is a vital, adaptive function of the human brain. Through personal stories—especially the speaker's experience with their grandfather’s Alzheimer's and their mother’s grief—the talk explores how forgetting can be both painful and healing. It highlights the neuroscience behind "adaptive forgetting" and emphasizes that letting go of certain memories allows us to preserve emotional well-being, process trauma, and keep moving forward. In the end, forgetting isn't the opposite of remembering—it’s what makes remembering possible. Lim Lee is a current junior at Korea International School, passionate about exploring the universe through astrophysics and data analysis. He’s drawn to the patterns in the cosmos and the questions that science invites us to ask.Outside the classroom, Lim finds joy in vocal expression, theatre, and the performing arts. Whether he’s performing on stage or singing low bass in his choir, he values the way performance can connect people and bring ideas to life.As a speaker at TEDxPangyo Youth, Lim looks forward to sharing his perspective on the world around us -- and beyond. This talk was given at a TEDx event using the TED conference format but independently organized by a local community. Learn more at https://www.ted.com/tedx