The brothers had their own schemes, all mocking and sneering at Prince Cheng.
Leaving the Capital City at this time, it's hard to say if he's smart or foolish. Heading to provide disaster relief now seems like trying to gain tangible benefits, after all, that's real gold and silver, and he can earn a reputation for doing practical work in front of the King Kang.
But whether smart or foolish, having such a fool shielding them up front saves them trouble.
The Emperor's favored son unwilling to shoulder this burden, an opportunity ready-made to gain prestige and public favor, yet he's unwilling to act, instead it's Old Fifth, impulsive and inflexible, truly wanting to share the burden with him.
The favored son only fixates on that position, while the unfavored son shows great tact, whether for the people or for him as the Emperor, it's genuine effort.
This makes the Emperor feel quite melancholic.
