Son of Brihaspati, the preceptor of the Gods. Kacha sneaked in as a spy to learn from Shukra, the preceptor of the Demons, the art of resurrecting the dead, Mrityusanjivani. Shukra had a beautiful daughter, Devayani.
For the story visit
http://talesfrommythology.blogspot.com/2013/02/devayani-and-kacha.html?q=devayani+and+kacha