Tang Suisui wakes up after transmigrating into a novel, where she has become the villainous female supporting character. To save her own life, Tang Suisui tries her best to win over a black cat. But the black cat's true identity is actually a prince of the Cat Clan, burdened with two shackles: the Abyss Breath he was born with and a seal. He is constantly tormented by the pain of backlash, and after the original owner signed a blood pact with him, he endured endless humiliation and abuse. On the surface, he works odd jobs to make a living, while secretly investigating the Abyssal Rift. Meanwhile, the villain of the Rat Clan is waiting for an opportunity to corrupt him and break the seal. During one backlash from the seal, Tang Suisui unexpectedly purifies the Abyss Breath. Little does anyone know that she, the girl who transmigrated into the novel, is precisely the otherworldly opportunity the Cat Clan has been desperately searching for.