JJ Lin is tall. To be honest, Sun Nan's treble quality is good and the timbre is intact. But when it comes to pitch, it's hard to come by. Sun Nan's pitch is a tenor entry level, and he doesn't like to work on numbers. He only cares about control. JJ Lin's treble ability is not his strong point, but he has good innate conditions and is better than Sun Nan on the spot. But JJ Lin's high notes are not ranked high in the entire Chinese language. . . .