A stun gun is a self-defense device that delivers an electric shock to immobilize an attacker. But existing stun guns were mostly bulky and hard to carry. Local startup 247 Korea has come up with an innovative solution to this by unveiling a smartphone case that doubles as a stun gun. After verifying the user's fingerprint, the case emits an electrical charge within two seconds and automatically alerts the police. We hear from the security startup's female CEO, who drew inspiration for the product from her own experience.