Reincarnated but…. where is the protagonist?

Lucian dies and meets and Unknown god who decides to reincarnate him with a system but the G*** of Ch*** notices him and tries to kill him. He is reborn as the prince of the dragon empire and ecides that he is not the protagonist because he would be reincarnate as a commoner instead of a prince. Jouney with him to see if he ever discovers the protagonist or that he himself is the main character…..