All things are trapped in the cage of obsession when they are born, and fall into the sea of desire when they die.
Either becoming a monster, becoming a spirit, or transforming into a demon or becoming an immortal, all due to the deeds of attachment to desire.
Obsessive desires are often named "emotion". The existence of a beating heart cannot be called heartless.
The so-called heartless existences are those who have never met anyone who can rely on their feelings.