Kangxi left the palace still with great surprise, curiosity, and faint expectation. When he returned to the palace, there were no expectations nor surprise, he was only left full of shock and… complexity.
Of course, he was in a murderous mood in the beginning. But after he calmed down, he felt something amiss because he didn't know who Qi Wenqing's backer was. Would there be anyone else who would want to assassinate her? Instead of facing an unknown danger, it was better to watch out for the known one with one’s own eyes.
Moreover, Qi Wenqing's last few words planted a trace of speculation within Kangxi, but he just felt it ridiculous again. However, if she was indeed telling the truth, then things would be easy from here on out. As a royal, what she owns naturally belongs to the royal family. The only thing was that he didn't know whose child she was.