Kim Sum, long after pioneering a distinctive AI chatbot, turned her ingenuity toward crafting Somebody, a dating application designed for connection. Unbeknownst to its users, however, the app became entangled with a series of criminal acts…

Seong Yun-o delivered a proposal at work, followed by a connection to a novel application. Sum contacted Yun-o after their peculiar meeting. The violence intensified.

Following a deeply unsettling encounter on a date, Yeong Gi-eun and Lim Mok-won turn to Sum, seeking her assistance in identifying the individual who caused such distress.

Following a stretch of silence, Sum finally receives a message from Yun-o. Sum attempts to connect with another through the application, but the encounter rapidly escalates into violence.

Sum and Yun-o deepen their connection. Separately, Gi-eun seeks an audience with the CEO of Spectrum, requesting access to her private communications.

On *Somebody*, Gi-eun faces the digital phantom that haunts her, and quickly finds herself embroiled in peril once more. Meanwhile, Mok-won conducts a ritual to protect Sum from malevolent forces.

Seeking a release from their worries, Mok-won and Gi-eun bring Sum with them to a nightclub. Afterward, Mok-won attempts to help Sum confront a difficult reality concerning Yun-o.

As the pressure mounted and threats intensified, Yun-o began to receive unsettling video chat requests on Somebody, the digital space feeling increasingly claustrophobic.