At school, they don't give autographs. They prefer to be like ordinary students in class, and their agents will also stop fans from asking for autographs at school. If you are in the company or attending activities, of course you can sign it. That's their working hours. If it is a special signing ceremony, so much the better. You can ask them what you want to sign, for example, wish someone a nice day. Sam Hyo-chi recently released a new album, and it is estimated that there will be a fan meeting or something soon.