C1356 Twin Demons
Chapter 56 Twin Demon Clan
Since there was someone with a similar power to Hong Ying on Liu Shuang's side, then Hong Ying joining their faction would be a better choice, and would be more beneficial to her future development.
As for Long Yu, he did not seem to have any special requests. If Hong Ying joined Liu Shuang's faction, then Long Yu would join Liu Shuang's faction as well