Rem, Death Note Wiki

Rem (レム, Remu) is the Shinigami who gives Misa Amane one of the Death Notes she had. Like Ryuk, Rem possesses two Death Notes; however, Rem did not get hers through trickery. The Shinigami Gelus, who had fallen in love with Misa, sacrificed himself to kill her destined murderer. In doing so he was reduced to dust, leaving only his Death Note. Rem delivered this Death Note to Misa, since it was her life he saved. Rem's appearance is quite skeletal, with long, spinal cord-like arms and bone-like s

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So, in death note's rule it says 'shinigami musn't tell humans the

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