App — Hdb One View

Towards Lina.

The bedroom door opened and closed. The kitchen tap ran for exactly 47 seconds. The bathroom exhaust fan turned on, then off. The main entrance never opened, which meant the visitor never left. They were inside the walls. Or inside the data.

She stared at the screen. The icon for Bedroom 2 turned from grey to a pulsing orange. Occupancy detected. hdb one view app

“Mrs Koh, I’m going to tell you something that isn’t public yet. The One View app uses a machine learning model trained on five years of sensor data from over 100,000 flats. Last month, the model started identifying a new category of event. We call it a ‘persistent non-resident signal.’ It shows up in blocks that have experienced… let’s say, sudden vacancies. The model doesn’t know what it is. Neither do we. But it’s now appearing in over 2,000 flats islandwide.”

The first anomaly appeared on Thursday. She was boiling noodles when a push notification buzzed her phone: Unusual humidity detected in Bedroom 2. Possible mould risk. Schedule inspection? Towards Lina

Her thumb hovered over it. The app’s interface was calm, corporate, almost cheerful. Would you like to speak with the occupant? it asked. This may resolve outstanding maintenance alerts.

“Ma’am, I’ve checked your flat’s sensor suite. All green. No malfunctions reported.” The bathroom exhaust fan turned on, then off

The corridor was empty. Fluorescent lights hummed. She stood outside #03-12. The door was the same as hers—wooden, with a rusted peephole. She didn’t knock. She just held her phone up and opened the One View app. She switched the view from her flat to “Adjacent Units.” There it was: #03-12. The 3D model glowed faintly, and inside it, a single human-shaped icon stood in the bedroom. Not moving. Just standing.

From 1 AM to 4 AM every night, someone—or something—was moving through her flat.

Lina did something she had never done before. She took the lift down to the third floor at 3:15 AM.

She hadn’t woken up at 3:17 AM. Neither had her husband, who snored like a chainsaw from 10 PM sharp. She checked the sink. It was dry. The pipes were old, she told herself. A glitch.