The other ghost is most likely Kiyoon's ghost from the past. When the young master he served finally passed, he cursed him for his death of being drowned in the pond (this was before Kiyoon passed through the cycle of reincarnation perhaps).
Since then, the young master (aka the ghost parasitizing manager Jung) has been blue balled and has been subjected for other 'humiliating' orders he's been told to do.
Kiyoon's uncontrollable mouth was probably his past self manifesting, if that makes sense.
Thank you for the update!! ╥﹏╥
The other ghost is most likely Kiyoon's ghost from the past. When the young master he served finally passed, he cursed him for his death of being drowned in the pond (this was before Kiyoon passed through the cycle of reincarnation perhaps).
Since then, the young master (aka the ghost parasitizing manager Jung) has been blue balled and has been subjected for other 'humiliating' orders he's been told to do.
Kiyoon's uncontrollable mouth was probably his past self manifesting, if that makes sense.