In troubled times, kings changed frequently, but there were four families that remained firm despite the ups and downs and held a transcendent status. The four teenagers gradually grow up to be the heads of their respective families. They face the checks and balances between the four families, the intrigues within the families, and the invasion of powerful enemies. They have different ideas and different choices. There is frank friendship, tender love, a life-or-death agreement, and heart-wrenching betrayal.