What is the horror movie "Siamese Yin" about?

"Conjoined Twins" tells the story of a pair of conjoined twin sisters. After surgical separation, one (Ping) survived and the other (Pi) died. The one who was alive felt that someone was following her wherever she went. Wherever Ping was, she was there.

Ping and her husband moved from Thailand to South Korea to start her new life. But one night, a phone call from across the ocean changed her life forever.

Ping’s mother suffered a stroke and was hospitalized. Ping immediately returned to Thailand with her husband after learning about it. After she returned to Thailand, she found that some strange memories kept emerging. At first she thought they were memories of her childhood in her hometown, but slowly she discovered that there was a force surrounding her and that someone was always there. The truth slowly unfolded, and it turned out that Ping was once a conjoined twin. Ten years ago, Heping's closest conjoined twin sister died during a separation operation.

"Alone" (Alone) is a horror film directed by Banzhuang Bisindanagang and starring Martha Walton, Namo Tongkumnerd and others. It grossed NT$35 million at the box office during its first weekend in Thailand, breaking the record of "Ghost".

"Siamese Yin" won the 2007 Austin Fantasy Film Festival Special Jury Award for Best Director, and the 2007 Scream Film Festival for Best Cinematography, Best Director, and Best Editing. 2008 National Film Association of Thailand Award for Best Actress and Best Original Song.

Reference: Siamese Yin_Baidu Encyclopedia