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
여과제를 사용하여 물을 깨끗하게 만들 수 있습니다.yeogwaje-reul sayonghayeo mul-eul kkaekkeuthage mandeul su issseubnida.You can use a filtering agent to make the water clean.