SECRET is known to be one of the sweetest girl groups in the industry, and their latest YouTube video shows exactly why. The girls created a video message for students in Korea, who are currently cramming for college entrance exams. While they encouraged them to work hard, SECRET also said that the most important thing is good health. Since the weather is getting chillier these days, fans should dress warmly to prevent catching colds. The girls concluded their advice session by saying it's important to sleep early and eat meals regularly. When you do your best, success is sure to follow. Check out their video below: