What do you mean you can't heal the scar and forget the unhealed pain?

This sentence comes from the song "Heal the scar and forget the pain-Sun Zihan's lyrics: Jiang Jiang". I really want to have a wandering smile

the unruly wind growls at me crazily

the bumpy figure dances with a wine bottle

the neon color seems so carefree

I really want to play with your innocence

to fly a kite and make it fly higher

But your hands are getting cold

The fairy tale is injured

I can't get over the scar and forget it. It means that after the scar heals, you forget the pain of the injury. It means that you forget what happened in the past after living a comfortable life. If you can't learn from the mistakes of the past, you will repeat them. The original intention comes from China's ancient art book Sima Fa Ren Ben: "Although the world is safe, it will be dangerous to forget the war."