Were all previous singers in Korea lip-synching? For example, Rekulong has many difficult songs, but the live version and the mv version sound almost the same.
If there is no accident, there will be no lip-synching If the voice is broken or there are any special circumstances, it will be lip-synched. But sometimes if you go to a concert and make it sound like another version of the mv, that's normal, because the mv will be processed and some sounds will be added to the computer to make it sound better. But if you look strange, such as your mouth is wrong, what you do has no sound.