Kim Yushin
But Bidam, who have been favored by the Queen, shouldn't have a reason for his sudden animosity or the desire to take the throne, without anyone noticing – especially the Queen. And so, some historians believed that Bidam, may have just been a victim of political manipulations by Kim Yushin, who have been trying to establish an absolute monarchy for Kim Chunchu. There was an alliance that was formed between Kim Yushin's supporters and King Kim Chunchu's supporters, after Kim Chunchu married Kim Yushin's sister. This alliance is what gave Kim Yushin a strong influence and power in the court, rivaling Bidam's power at that time. The problem starts after Bidam got appointed as the Sangdaedeung – a position that made Bidam the most powerful man in Silla.