Su Ming should leave.
Even if he did not leave, he should still treasure the serendipity the old xun maker had given to him, because this three-day-long serendipity could help him fight against the great disaster he was about to face in the near future.
He should destroy the beauty of this fictitious world, kill all of these possibly created characters—including his family, his friends, his love, and everyone else—to obtain a resolve to give up everything so that he could become strong and fight against fate. He would be remolded once he destroyed everything, and would obtain the cold callousness that belongs to the strong!
This was the true meaning behind the three-day-long serendipity. It was also something the silent old xun maker wished Su Ming could do!