The reason K asked this was because months ago, he had personally witnessed Feng Ling's ruthless resolution; he had seen her firm rejection of Li Nanheng and XI Base.
Since then he had been worried that Feng Ling would never return.
After waiting for so long, she had finally returned. However, he instinctively felt that this matter wasn't as simple. At least, based on his understanding of Feng Ling's character, there was no way she would agree to returning this easily