Smart Crowd Analytics, the world's first LiDAR smart city solution introduced by Seoul City, analyzes people flow in narrow alleyways, ensuring safety through real-time congestion analysis for prompt decision-making by operators to prevent accidents. With a daily average of over 10,000 people per site, it deploys alerts to citizens when certain risk events occur. This affordable solution costs less than $0.01 per person and facilitates rapid and widespread deployment. The solution has now been expanded to airport queue management and shows great potential for application in various industries.