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
타산지식이 있는 사람은 항상 자신의 이익을 먼저 생각한다.tasanjisik-i inneun saram-eun hangsang jasin-ui iig-eul meonjeo saeng-gaghandan.A person with self-interest knowledge always thinks of their own benefit first.