erm.....I have finish these 2 quests, BUT...i don't really remember the exact rewards. The rewards is some amount of exp, then there's another quest that follow!! Something like 10 roasted chicken + 10 steamed fish to be passed to somebody; another is 10 Soup + 10 Dumpling also to be pass to somebody. I get cursed scroll for both these 2 quests.
After doing these 2 quests, the Cai Shen & Sima Qian's quest is still repeatable!! So, keep collecting and get 20k exp!!