Season 1 of Loop premiered on April 11, 2012.

Paeng, a servant girl, obsesses over Khun Luang, who falls in love with and marries Cheun Klin. Feeling betrayed, Paeng uses black magic to make Khun Luang love her instead. Cheun Klin's mother intervenes, imprisoning Paeng with a protective spell. In the present day, Khun Luang and Cheun Klin are reborn as Samon and Rampa, with children. They return to Thailand, where Cheun Klin's mother's spirit guards their old house. Paeng's vengeful spirit remains trapped but tries to lure the children to free her. Samon eventually frees Paeng inadvertently, causing her to seek revenge on the family.