Perhaps by the time he returns from avoiding disaster, Yu'er's cultivation would not have regressed, and the spirit medicine in the Medicine Garden would have matured.
With this idea in mind, He Song began to weigh the pros and cons.
He would let Yu'er stay in the cave mansion and plant new spirit medicine in the garden.
He would also give his puppet the task of feeding Yu'er the daily Beasts Elixir, as well as tending to the spirit medicine in the garden.
In this way, He Song would no longer need to worry about the cave mansion.
Whether it's Yu'er's daily consumption of the Beasts Elixir to increase her cultivation,
or the care of the spirit medicine in the garden, all would be handled by the puppet he left behind.
As long as nothing unexpected happens,
by the time He Song returns, the situation might be as he expected, with not only Yu'er's cultivation not regressing, but also the spirit medicine in the cave mansion maturing.