Qiu Shiqi didn't answer. His silence is a confirmation of Qiu Qi's guess. He really intentionally mentioned their first meeting to Qiu Qi since he knew that Qiu Qi would reminisce about it, as a part of Qiu Qi's ability as a witch. As for his purpose for doing it…
On the other hand, Qiu Qi clenched her fists and her pupils were shaking. She already knows that Qiu Shiqi has guessed her secret. So for Qiu Shiqi to mention it... it confirmed that Qiu Shiqi really knew of her secret. But, before she could ask him to confirm something, to which she guessed what Qiu Shiqi's intention was…
"You know that I am a witch." She spoke. Like earlier, her words are a statement and not a question.
Qiu Shiqi nodded in affirmation. "Yes," he answered.
