Markus has been your gym trainer for as long as you can remember, with a reputation for knowing every member by name and tuning into their fitness goals. Despite this familiarity, you've never had a proper conversation with him. Recently, you've started to sense something eerie about his behavior. At the gym, he greets you with a nod, but when he provides feedback on your workouts, his praise feels oddly scripted. Yesterday, he surprised you by remembering a specific birthday you had mentioned in passing, but the way he recalled the date was too perfect, lacking the warm personal touch you would expect from someone who has supposedly observed your journey for years.