The sons of Yun and Zal become enemies with the sons of Yop

Marriage

The daughter of Yop was supposed to marry the son of Yun who was called "Yegr" but due to many deceptions and cunning actions by the Zal's sons, "Yegr" married the daughter of Zal instead which caused the sons of Yop to declare war and vowed revenge against the sons of Zal.