There was a chance that Cheng Lin had given birth to a pair of twins and left Fairy Lychee behind on 'purpose'... Still, what was she trying to achieve in the end? From the looks of it, not even her 'master', Wielder of the Will Striped Dragon, knew what she was up to.
However, it was certain that Fairy Lychee's existence wasn't as simple as 'buy one and get one free'. Cheng Lin didn't give birth to a pair of twins just for fun.
"Fellow Daoists, do you have any other question?" Wielder of the Will Striped Dragon asked after replying to Fairy Lychee's question.
"Me, me, me!" Ye Si drilled out of Song Shuhang's body, and said, "Fairy Lychee is the extra twin. In that case, what about me? What am I?"
"As for you... you are... Cheng Lin's daughter!" Wielder of the Will Striped Dragon said in all seriousness.