So far the real Dong Fang Xian Yu seems to be an amazing manipulator. The fourth brother didn't die but was hiding, he married the third sister so she wouldn't be taken by others who would use her and shortened her lifespan, and even his marriage to the heaven messanger is apparently a lie as well. Too bad he wasn't good enough to avoid other's manipulations that he and Yin Fei Xing ended up pitted against each other.
I'm also interested to know who exactly he is, since going by the revelation that Yin Fei Xing is suppose to be the Dong Fang child, who exactly is Li Xian Yu then? There is also the plot thread at the start when he first fell down the cliff that apparently his previous twin chakra, the one he threw away when he was kicked out the first time, wasn't even his own.