Let's just go with the flow for now; after all, Zhang Chi has not shown any affection towards She Shishi yet.
Zhang Chi did not pay attention to the small interactions between Chen Runyu and She Shishi. It was just women fighting and getting jealous over him, something he was used to.
And his consistent approach was to play dumb and cute, letting them fight it out.
Handsome men are only meant to be owned by the strong. As long as they don't go too far, like setting up a cliques as in palace dramas, he wouldn't get involved.
Now, of course, he was earnestly explaining the rules to Chen Runyu.
As for the strategy of hiding the Blood Crystal Stone, Zhang Chi did not share it with Chen Runyu.
By now, Chen Runyu's strength should have increased significantly, and Zhang Chi had not forgotten that his main task was to search for clues about Gu Youyou's whereabouts.
As long as he found Gu Youyou, and she was still willing to stand by his side, they would be able to remain invincible.