Pink finds a type of strange bacteria in Nate's. Before the truth is told, Nate kills herself. As Pink dates Q, a man whom she met on a dating app, she has no idea that things around her are turning into a nightmare.
After having sex with Q, Pink finds reeking fluid discharging. Pink finds out that she is infected with strange disease and is also pregnant. As Pink encounters strange incidents, They prove that she is not pregnant with a human baby.
Pink realizes that the baby in her womb has grown a lot, although it has been only one day. Pink wants to have an abortion and she asks Por for help. Por starts to investigate Q, who's involved in the beginning of the entire incident.
Lada gets hired to take care of the bedridden patient, Her Serene Highness Srisaang. Lada finds many strange things inside the mansion. And she has to keep her mother, who is fleeing debt collectors, hidden inside the mansion.
Her Serene Highness becomes stronger and she's able to walk on her own. She asks Lada to bring her to a locked working studio. In this room, Lada finds out a secret that makes Her Serene Highness look younger.
Lada calls her boyfriend to come over. However, she does not realize that is part of Her Serene Highness's plan to complete the requiem. However, Lada has no idea that Her Serene Highness's real plan is more complicated than she thought.
Off's news column has caused the death of a mother and her son. As the ghosts haunt him, netizens put pressure on him. Off decides to shut down his news column. He approach his net idol friend, Boat, to create channel called "After Dark".
Off and Boat create a show together called "After Dark". They explore an abandoned building. According to rumors, a lady was killed and was thrown to the water tank. As the duo explores building, Off realizes that something even scarier.
Off and Boat go to an abandoned asylum. This place was not just a treat mentally patients, it was also used as a tool for people with strong power. As the darkest secret reveals, They encounter an accident that has never happened before.
Chai and Om are best friends in doing an illegal business; they take videos secretly and sell the video clips via an "Open Chat" software called "XTH Room". As both encounter a new victim, their lives are about to change forever.
Chai begins to develop a strange relationship with the mysterious woman, which later forces him to choose between friend or love. When Om goes missing, Chai tries to find Om through this mysterious woman, the only clue that Chai has.
Chai's and Dao's relationship is becoming stronger, and Chai has really fallen for Dao. Dao introduces Chai to "Kalakasu cave" and her dark secrets. Final destiny awaits with Chai and Om last encounter, which causes Chai to be terrified.
Everyone realizes that the real intention for "After Dark" is not about finding the truth to Kalakasu. The revelation unveils when they meet Dao, who holds the key that leads everyone towards an unexpected conclusion.
