Nian Bing's brows furrowed slightly as he muttered to himself, "This door is very strange. Feng Nu, have you discovered anything?" As he spoke, he turned to look back at Feng Nu, only to find her gaze intensely focused on the ruby Phoenix on the protruding part of the stone door. There was a contemplative light in her eyes, as if she hadn't heard Nian Bing's inquiry.