**2. Living conditions of Korean university students**

Looking at the change in the population aged 15–24 including college students in the "Special Estimate of the Future Population" of the Statistics Korea [2], the ratio continues to fall. It is expected to account for 12.7% of the total population in 2017, 11.3% in 2019, 9.1% in 2025, 8.6% in 2030, and 7.1% in 2050.

In 2020, the average sleep time for adolescents (9–24 years old) on weekdays was 8 hours and 20 minutes. The average sleep time for each age group on weekdays was 9 hours 13 minutes for 9–12 years old, 8 hours 4 minutes for 13–18 years old, and 8 hours for 19–24 years old. In 2020, the employment rate of the youth (ages 15–29) is 42.2%, and the unemployment rate is 9.0%. The employment rate by age group was 6.6% for those aged 15–19, 41.1% for those aged 20–24, and 67.6% for those aged 25–29. In 2020, the proportion of employed people in their 20s by occupation is 28.2% for professionals and related workers, 22.1% for office workers, and 15.2% for service workers. In 2019, the average wage of 20–24-year-olds increased by 7.7% from the previous year to 2,152,000 won, and the average wage of 25–29 years old was 2,583,000 won, 4.7% from the previous year. 64.0% of 19–24-year-olds had part-time work experience [4].

In 2020, the average weekly internet time for teenagers was 27.6 hours, and for those in their 20s was 29.5 hours. The main purpose of using the Internet is education and learning for teenagers and acquisition of data and information in their twenties. In 2020, adolescents (ages 9–24) responded that school life had changed negatively, and family relationships had changed positively due to COVID-19. In 2020, 46.0% of youth (ages 9–24) answered that their academic stress increased due to COVID-19. The 19–24-year-olds answered that they had the most troubles in the order of job (40.3%), study (16.9%), and physical and mental health (9.4%). Most of the 19–24-year-olds consulted with friends or colleagues (49.0%), followed by consulting with their mother (19.6%), and solving problems on their own (17.7%) [4].
