AR is music recorded with the singer's voice and accompaniment, and MR is music with only accompaniment. I guess your voice is a little low. He is a backup singer. You can search for accompaniment online. They all have backup singers. Not the whole capital. Most of them are at the climax. It's about lip-synching Almost all Korean love beans are singing and dancing. There is no way to keep breathing and singing steadily while ensuring good dancing. In the past, almost all love beans were lip-synching. Much better now.