When the unpredictable Old Ones awakened, bringing their black mist and crimson moon, the world plunged into an eternal night of decadence. Less than 10% of humanity remained, huddled in the steam-belching Brass City. They exploited the Destiny Dimension to enter horrific dungeons and acquire extraordinary powers, yet they lingered on, on the brink of extinction. Then, the writer stepped forward. "Only the Old Ones can defeat the Old Ones!" Li En, a pink, oval-shaped cell cluster, consulted his diary, his two tiny tentacles alternating in front as he pondered deeply. "So, this is why I was summoned here?"

An unknown event awakens everyone on Earth to become Card Masters. The world enters a data-driven mode, and countless secret realms descend upon Blue Star. Countless demons and monsters wreak havoc on the world, and behind these secret realms lie connections to countless other worlds. Card Masters rise to power, wielding extraordinary strength to explore the truth behind these secret realms. The protagonist, Lu Ziye, awakens a god-level talent and discovers the entrance to the "Howling Cave" secret realm in the basement of his own villa. Seizing this great opportunity, he commands spirit beasts, rises rapidly, and traverses various secret realms, seeking the unknown truth behind them.