Protagonist: Lin Xiaoyu (human) / Mo Ying (black cat)
· Human status: 17 years old, a sophomore in high school. His parents died young and he was raised by his grandmother scavenging. Sensitive and introverted, she has a crush on her deskmate Su Qing and has not dared to confess her feelings for three years.
· Cat body condition: A pure black stray cat with a notch in its left ear. It has actually been guarding the Lin family for three generations, and has the blood of the ancient "World Guardian Spirit" sealed in its body.
