Sa Kang-Gwon is a Trace with the ability to manipulate ice. His powers had been with him since his birth, and because he could not control them, Kang-Gwon accidentally attacked his own parents. With no cure or solution to Traces, his parents abandoned him on a street next to an old beggar woman Trace who could conjure fire. He wandered around for an indeterminable amount of time, living his life as a scavenger and losing his emotions. He engaged in battle with his first Trouble, but after realizing he could not defeat it, he encased himself in ice until it disappeared.