"When I opened my eyes, I was in a place I had never seen before."

Necessity and Coincidence is a multi-ending escape room game where players must collect as many clues as possible from the cute but slightly scary kidnapper (Woonyeon) who has imprisoned them, leading to multiple endings. The protagonist is imprisoned by a stranger for no apparent reason, but Woonyeon acts as if he's known them for a long time. The goal is to gather as many clues as possible from the room to ensure a safe and secure escape.

The game consists of two formats: escape room and stalking. The escape room section is simple and click-based, while the stalking section involves following Wooyeon, who has gone out, from a suitable distance to uncover her secrets. The ending varies depending on the clues you collect in both the escape room and stalking sections. Gather as many clues as possible to survive your inevitable fate!