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
이 문제는 천근만근처럼 느껴져서 해결하기가 힘들어.I munjeneun cheongeunmangeuncheoreom neukkyeojyeoseo haegyeolhagi ga himdeureo.This problem feels heavy as a mountain, making it hard to solve.