Although Lord Ling bought the music, the music was in Gu Ruxue's hands and she took it as her own. Also, this music had called out the phoenix and so was a very precious thing.
Hearing that the music was going to be used for something else, Gu Ruxue subconsciously had no intention of offering it and became alarmed.
She was in possession of the music, and Zhou Huailing had predicted that would happen, so he tried to sound very seductive. "I have reached a deal with Prince of the North Qi, and he is offering us ten magical monsters for this muc."
"…"
"Ruxue, it is a great piece of music that calls out the phoenix, but did you even notice that Gu Chaoyan called the phoenix out first, and you second, so a phoenix is not a rare thing anymore, and it won't be very useful. In this case, why not just use it to get ten magical monsters instead."
"…"
"Ten magical monsters can be as powerful as a military troop"
"…"
