Sun is one half of a marriage in trouble - with her husband, Jin, acting as a literally silent partner.
Sun's extensive knowledge of herbal medicine could prove invaluable to the survivors, but her relationship with the group is compromised by her husband's refusal to integrate.
And when he discovers that she's been keeping a secret from him, it appears that their already rocky relationship is heading for an irreversible breakdown.
But what was the root cause of the problems in their marriage - and what drastic steps is she prepared to take in order to save it?
