20 degrees (S01E05)

Jiyoung, a gifted young iceman, is discovered frozen to death inside the supergelator at the factory where she worked. As Charlie investigates, he learns that her career had given her nothing but false friends—and possibly a motive for revenge. But the deeper he digs, the more unsettling the truth becomes: Jiyoung walked back into that freezer on her own. The question is, why would she choose such a cold end?