If you loved The Call, try Seobok
A bridge between a film you've already seen and one most people haven't. Seobok has roughly 3.8× fewer votes than The Call — it's a deeper cut, not a mainstream recommendation. Here's what they share, and what the second one does that the first one doesn't.
What they share
Theysit in Mystery / Science Fiction / Thriller territory. If that's the register that drew you to The Call, the second film will land in a comparable space — through a different lens.
What Seobok is
Rain-slicked highway, late autumn, a syringe glowing faintly on the passenger seat. A disgraced agent drives south with a pale young man in handcuffs who flinches at sunlight. Men in clean suits follow in silent cars. Like a Park Chan-wook thriller written by a sleep-deprived biochemist.

