I see people trashing Suu here but he might be the only relatable character here, he was doing what he can for Nadan and how is Nadan's death his fault... Isn't it Nadan's fault for being too nice to someone he just met and getting involved in a plot in the first place!?
And what's the problem in being a self server!? Nearly every character is like that. Remember the Nara girl saying how the crown prince only sleeps with someone who is of use to him. He did the same with Suu and if Suu also used him then why it's bad. Sahara likes Suu and Suu cares for him deeply too, he even slapped the crown price and with his love for his own life, we should know what a big step he took.
Stop trashing characters that makes you feel how inferior your thoughts are and that you can't find solace of the pseudo perfection in 2D world
Where the Dragon's Rain Falls