He was pretty useful!
However...
"Last time when I lived here, I didn't detect your presence, let alone see you. Why so?"
Gu Li's expression turned serious as he considered Yu Holea's question.
"There are certain times when our presence is stronger, and other times when we're almost invisible. It depends on the energy in the house and the state of the binding spell.
Like on full moon days when the lunar energy is at its peak, our presence becomes more tangible.
Other times, especially during periods of harmony and positivity in the house, we fade into the background."
Yu Holea nodded thoughtfully.
"Fine. Do you remember the spell your father used to save you? Without knowing the entire spell, I can't guess where your father made a mistake and ended up binding you both to this mansion."
Gu Li nodded,
"Sure. I know it. I can even write it down."
Then Gu Li wrote the spell. Yu Holea asked him to leave.