Joseph Gordon-Levitt wants you to know that it’s OK to not be OK — even if it appears you have more than most. The actor leaned into that notion when he created his new Apple+ series, Mr. Corman, which is set in Van Nuys, California, and centers on a thirtysomething aspiring musician who is now a fifth-grade teacher. Although he thoroughly enjoys being a mentor to his students, he still feels unfulfilled, leading him to tackle with self-doubt and anxiety.