It is learned that the prototype of the story is a German legend - if the male partner of the water elf Undine cheats, Undine will kill the partner and return to the water to live again. Petzold made such a "Liao Zhai" story really modern and charming. In the opening cafe scene,
Johannes said, "We have to meet." Undine flipped out his phone and said, "Your voicemail said 'I need to see you'"; "I'm going to work now, you wait here for an hour and a half, and when I come out, You have to tell me that you love me. If you're not here after I come out, I'll kill you." Undine's stubbornness is evident. The identity of the part-time tour guide of Undine Urban Development Museum, on the one hand, restores Undine's "elf" identity as witnessing the changes in Berlin; on the other hand, it continues Petzold's retrospect of German history and geography. It is not surprising that the water tank in the cafe and the industrial diver in the water tank appear alone in the story. When Undine's shouts came from the tank, one was an encounter with Christoph; one was Christoph's foot being swept into the turbine, and Undine's mind echoed. The second shout seemed to fold the time between Undine and Christoph's encounter and love, and then his death. Undine's memory suddenly jumped to the time when Johannes left, so she got off the train and went straight to fulfill her own promise to kill Johannes. The industrial diver model is the incarnation of Christoph. One is that his job is that of an industrial diver. The other is that he was involved in a turbine, resulting in brain death due to hypoxia. In the hospital, Monika accurately stated that the time of Christoph's accident was between 14:57 and 14:57. Between 14:30, Undine's colleague just broke the leg of the industrial diver model. The catfish and the piers engraved with Undine letters confirm the fact that Undine comes from water.
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