After the banquet, not a single one of Kurobei and the others refused; they gladly agreed to have the Cursed Seal planted.
To make Kurobei and the others truly believe in the existence of the Cursed Seal Jutsu, Yayoi even deliberately brought Raizo out from the Heavenly Dao Palace during the banquet, letting them witness with their own eyes that Raizo's bodily functions had recovered to their peak state.
However, the flaws of this Cursed Seal were also significant. Once it was planted, the person had to spend long periods in special areas rich in chakra energy to absorb a massive amount of chakra and maintain their bodily functions.
Still, it was not strictly necessary to stay inside the Heavenly Dao Palace at all times; it was just that the duration of every outing had to be strictly limited, and they could not linger for long periods of external activities.
Therefore, barring necessity, once everyone entered the Heavenly Dao Palace, they could no longer freely 'descend to the mortal realm' and were only permitted to come out under special circumstances.
It remained uncertain how long this situation would need to continue, but it was certain that as the Cursed Seal Jutsu became increasingly refined in the future, these 'restrictions' would also grow progressively weaker and eventually be lifted.
As a result, those who had initially felt somewhat puzzled by Yayoi constructing the Heavenly Dao Palace gradually realized that Yayoi might have begun preparing for this 'Eternal Life' plan even earlier than they had anticipated.
It was highly likely that corresponding contingency plans had existed even before the Shinobi World War, and it was only due to the outbreak of war that the construction had been postponed for a little while.
Moreover, the Heavenly Dao Palace was not like the rumors