The Sea Mother (or Sea Mama, as Yuri calls her), is a healer from the port-town of Dalian. She is introudced trying to save the life of a cursed man at the town's inn, set on him by a malicious spirit, Li Li.
She performs rites to ward off evil in a small fishing village in Dalian. She tries to protect the village people from a young girl's curse. She used to be a beautiful woman.
After Alice is taken by the same curse, Sea Mother reveals her connection to the spirit, having known her before death and how she came to be as she is now.
The healer later stows away on the smuggler's boat that Yuri and the group are taking to Shanghai, knowing that Li Li will not give up so easily. Her intent is to help the poor girl move on to Nirvana, and even expresses that she would give her own life to do so.
Ultimately, she does aid in Li Li's passing to the afterworld, only to die moments later from using up every ounce of energy and power to do so. Alice sends her off with a prayer to the heavens to look after her.