How did the scar on Liu's leg burn?

I was scalded by water when I was a child. Because hot water can burn people's skin and leave scars. The scar of Liu's calf burn is like the shape of the moon, which happens to be called "full moon" by his fans. There is no shortage of "metaphysics" at the peak of the times, and there is no shortage of stories on the eighteenth floor. Liu is destined to make a debut and will certainly become the pride of his brother.