How could Tristan not be angry?
Suzaku, one of the Four Great Princesses, was a lifelong concubine who was handpicked by the family. In other words, once he was officially married, Suzaku would be her bed-warming servant.
Although he was going to marry Daya, he was much closer to Suzaku and had greater faith in her.
His dependence on her would be even greater in the future.
However, Suzaku actually lost to another man, and now even had to serve him as a servant for three years. Who knew