Original: อายุมั่นขวัญยืน
Pun, a thousand-year-old vampire, longs for a quiet life until he meets Yo, a cheerful college student. Their unexpected encounter sparks a supernatural romance.
In order to study Pun, Yo decides to move into a nearby apartment to study Pun's lifestyle.
Yo and his friends figure out a way to test whether Pun is a vampire or not.
After Pun takes over the pork blood soup shop, he decides to listen to Yo and Kamsai's advice and start the business again.
The pork blood soup shop hires a new employee, and another mysterious man suddenly shows up in front of Yo and Pun.
The gang makes a song to bring business to the pork blood soup shop, but Pun is unhappy again when Somchai shows up without warning.
As business at the pork blood soup shop takes off, Pun accidentally hears something from Yo that makes him sad.
Yo thinks that Pun is involved in a murder case and asks him to turn himself in, and the two of them finally resolve their misunderstandings.
Worried about the news regarding vampires, Yo decides to ask Pun for help.
Somchai's confrontational demeanor makes Yo see a different side of Pun, so he decides to offer Pun support and comfort.
As Yo realizes Janja's identity, he realizes that one of his classmates has bite marks on her neck.
Yo accidentally learns about Pun's relationship with Somchai, while Pun reveals shocking news to the group.
Yo learns about the origin of the mark on his neck, and Janja is finally willing to let go of her feelings for Pun.
