The system felt that it was really a mistake to parasitize this little bitch Yue Mu.
Yue Mu: Baby, I miss you so much.
System: I miss you so much, baby.
This is actually a system that traveled to various worlds alone to collect "the power of love". As a single dog, he was unconvinced and parasitized on an active recipient (pseudo).
Therefore, the system that dares not really love can only "engage" with Yue Hui, one world at a time.