Su Yi understood then, Prince Wu had to be observed.
Su Xinyi originally wanted her elder brother to observe Prince Wu secretly, but she thought that Prince Wu might see through due to her elder brother's temperament. It would be better to just interact openly and honestly.
As for the supervisor, she had other informants in the trade team, and undoubtedly there would be other preparations on Prince Wu's side.
Prince Wu, however, was overly kind-hearted. She still had to make her own arrangements, but for now, she thought it best not to inform her elder brother.
She was beginning to sense that something was not right. Given Prince Rong's current disposition, he would not have the intelligence or courage in his previous life to compete with Prince Wu, but he had indeed tried.
Before, she only suspected Prince Rong, but now she thinks there must be someone instructing him from behind. If she thinks this way, things start to make sense.