Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
식별자는 데이터베이스에서 각 항목을 구별하는 데 사용됩니다.sigbyeolja-neun deiteobeseu-eseo gag hangmogeul gubyeolhaneun de sayongdoemnida.An identifier is used to distinguish each item in the database.