It is an app for public bicycles (Seoul Bicycle-Ttareungi) operated by Seoul Metropolitan City that allows you to sign up for membership and purchase, rent, return, and check rental offices. It was prepared to promote the use of bicycles as a means of transportation to solve the problems of traffic congestion, air pollution, and high oil prices in Seoul, and to improve the quality of life for a healthy society and citizens. Eligibility ｜ 13 years old or older (13 years old requires membership