The film didn't say who it was in the end. The sister of "the grassland is at the end of the sea" is Du Siheng. She took 3,000 orphans by train and crossed half of China to Inner Mongolia, where she came to a completely unfamiliar grassland environment. The film is also based on Du Siheng's vision, but in this film, the film does not explain who Du Siheng ended up with, which is an open ending.