The first segment, "Happiness," follows a teenage girl named Joy who is left alone at home during the summer. Lonely and bored, she starts messaging anonymously with a stranger who listens to her problems and makes her feel happy. However, as she gets to know him better, she realizes that he may not be who he says he is.
The second segment, "Tit for Tat," is about a schoolboy named Ton who is constantly bullied by a gang of older students. Seeking revenge, Ton turns to black magic and enlists the help of an eccentric neighbor to get his revenge.
The third segment, "In the Middle," follows a group of friends on a camping trip who encounter a water kayaking accident. As tensions rise and secrets are revealed, the group must confront their fears and work together to survive.
The final segment, "Last Fright," is a psychological thriller about a stewardess named Pim who is flying solo in an empty cabin with a dead body. As she begins to experience strange occurrences and eerie messages, she realizes that she may not be alone after all.
Overall, 4bia is a horror anthology film that explores different themes of fear and terror. Each segment presents unique characters, settings, and storylines that keep viewers on edge until the end.