Redan

Redan (Rwedan, Rwehdahn) is a compressed baang of Shinsoo, the current of which, after swallowing it, reacts with the current in one's own body, generating explosive power. The technique can only be used by a few selected families.

This is a technique increases the power of a Regular; in Ran's case it's a baang with electrical properties that makes electric currents flow through his body, thus increasing his strength and speed.

This technique is extremely hard to control; even Ran can only control it for 5 minutes.

The Redan causes marks called "Soo Heun" (수흔, Soo'heun or Trace ) to appear on the user's body (in Ran's case, on his cheek), which differ depending on the amount and type of Shinsoo.