Duolingo attended LE SSERAFIM’s 'PUREFLOW' show in Newark to celebrate YUNJIN’s birthday! 💚🎂 “dialing 1-800-hot-n-fun, a new 25-year old YUNJIN is here” — 🔗 #PUREFLOW_IN_NEWARK #LE_SSERAFIM #HUHYUNJIN