Suddenly, in the forest, Mak's old wartime wound reopens. This time, they were successful and capture Mak into the forest. They attempt the second time by capturing Mak while they were in the haunted house.
Mak's friends attempt to convince Mak that Nak is a ghost at the ferris wheel, but they and the waiting queue were chased away by Nak. Later, Mak and Nak go out on a date in the town, visiting an amusement park. One of them involve a wordplay "Phi Sua" lit: "Butterfly", that requires Nak to be described as a ghost "Phi." Mak then dismisses all of their warnings, proclaims that they are no longer his friends, and kicks them out of their accommodations. Mak invites his four friends up to eat supper, in which they are given leaves and worm made by Nak. The drunk villager who had also tried to warn them earlier also turned up mysteriously drowned. The following day, Ter accuses Shin of being delusional, however, while taking a dump in the forest, Ter discovers a decomposed corpse behind the house wearing exactly the same ring as Nak. Shin, however, while he was sent to fetch Mak, saw that the house was a dilapidated wreck that hadn't been maintained for months as one of the stairs broke, that the baby cot that Mak and Nak's son, Dang, was supposed to be sleeping in, was rocking by itself, and then he saw Nak extending her arm to an unnatural length to retrieve a dropped lime under the house. Mak's four friends then discuss what they had heard, but dismiss the rumors as ridiculous. A drunk villager attempts to shout out a warning to Mak but is forced down and hushed by her son. The following day, the men visit the village market but are shunned by the fearful community who refuses to sell their goods to Mak and runs away. As it is now too dark to continue traveling, Mak's friends decide to stay. The five soon arrive at Mak and Nak's house during the night, and Mak introduces Nak to them. When Mak and his friends arrive back in Phra Khanong in the evening, they find the town completely silent. The villagers in the neighborhood then heard her singing lullabies to her baby, terrifying them and forcing them to cower in fear.
Shortly after, rumors started circulating the village that Nak had died in labor and was now a ghost of a very powerful form haunting the house. Meanwhile, in Phra Khanong, Nak struggled alone painfully to give birth to the baby she calls out for help, but she is too weak to be heard. He was wounded during a battle and sent to a medical camp, where he met fellow soldiers Ter, Puak, Shin and Aey, who later became his best friends after he had saved them from certain death. Mak ( Mario Maurer) was drafted to serve in a war, forcing him to leave behind his pregnant wife Nak ( Davika Hoorne) at the town of Phra Khanong, not far from Central Bangkok.
The story is set in mid-19th century Siam, during the era of King Mongkut and at the height of the Rattanakosin Dynasty, when Siam was plagued with wars with its neighboring kingdoms.