The wiki confirms a life-or-death incident near Mt. Eternal in the Arctic, unlocked at Main Story 5-8 under the label 'Ties with Mt. Eternal.' It occurs between Zayne completing his MD (2043) and winning the Starcatcher Award (2046). Specific details remain undisclosed in the wiki. Dr. Noah — Zayne's teacher and MC's original cardiologist — is connected to Mt. Eternal: he rescued a white fox named Pie from there. In the Homecoming Wings present-day arc, Zayne and MC travel to the Arctic to see Dr. Noah together, revisiting this connection.