Kacha Devayani

Kacha is the son of Brahaspati, the Guru and leader of Devas (heavenly people) Devas decided to send Kacha as a disciple of Sukracharya, Guru of Asuras (Demons). Devas and Asuras went to war with each other and the Asuras were brought back to life. Devayani saw Kacha and fell in love with him and asked him to marry her. Kacha refused saying she is his Guru's daughter and therefore she is also like a Guru.