The back story is complete: the strange fish lives in a special aquifer under the sanatorium for three hundred years. Two hundred years ago, the baron was determined to create a pure life. He wanted to marry his own sister as his wife, use the people to do experiments, hang the priest, and on the wedding night, the angry people burned the castle together.
The Baron's sister was pregnant at the time, and the baby was thrown into the aquifer and survived; so did the disfigured Baron.
A hundred years ago (1912), the baron rebuilt the castle, using the guise of a sanatorium to attract rich people without relatives to continue his research, using strange fish to extract the life of patients to create life essence, and use this to win over to establish an evil organization. The baby Hannah of that year developed slowly and needed to take life essence for a long time. The baron waited for the day when Hannah matured, and then forced her to create a purer life. He was destroyed by the male protagonist and resisted by the female protagonist. Killed, the nursing home burned, and the two fled. . . .
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