There are many logical basic stories that are difficult to refer to because there are fewer examples than expected. In terms of cost, the lecture content is very short and poor, and there are many random stories for this price. If the price is 50,000 won, it should have provided more examples, and it should have shown actual written texts to provide a proper guide. The lecture time of about 5 minutes per lecture was not an actual compressed lecture, but only theoretical stories. In that sense, the price of 10,000 won is appropriate for the class. It is only suitable for people who do not have time to watch blogs or YouTube.