Xiao Shui Han comes from "The wind is rustling and Xiao Shui Han, and the strong men are gone forever", which is a poem describing the period when Jing Ke stabbed the king of Qin. Yishui is the name of a river. "Cold" is a blend of scenes, cold on the water, giving people a cold feeling.
Snow-white skin will eventually turn into bones, so it's better to make great achievements with your sword as early as possible, be a hero like Jing Ke in those days, and don't dwell on children's affair.