Recently, teenagers show big purchasing power in retail industry. Online shopping malls re also in similar situation. Therefore online shopping mall companies want to manage teenager customers properly. This study is about understanding current status of teenager customers in online shopping mall industry and deriving strategy for management of teenager customers based on the status. Successful CRM for teenager customers can be achieved by building a segmentation of customers along with their behaviors and needs. Each segment should be managed by proper communication plan which is differentiated in accordance with segment characteristics.