Just the story NOV, it can work. It's not like VPK or Deiva Magan or Gauvaram where onscreen performance is vital.
It has a decent thriller plot, undercover cop, and a lead character who seemed to be not who he is. Can definitely be updated. Yen, Sigappu Rojakkal is a kinda updated Puthiya Paravai with additional horror elements and the character is made more psychotic.