In a certain sense, Ye Shikai and Zeus have an irreconcilable "grudge" between them, which is unrelated to personal experiences. Ye Shikai is the Netherworld King, while Zeus is the Divine King. In one world, how can two sovereigns coexist? If they could, it would be a mockery of the very concept of "king," and thus, it is destined that only one of them can exist.
So, if Ye Shikai doesn't kill Zeus, Zeus will certainly come to kill Ye Shikai, trying again and again, until one is dead...
Ye Shikai has resolved that one day, sooner or later, he must kill Zeus to eliminate future troubles, but definitely not now.
For now, he could only have the warriors of Netherworld Palace be a little more cautious of Zeus, to prevent him from doing something outrageous, especially during the wedding.
