On their 100-day dating anniversary night, horror game player Lin Xiaolu was urgently summoned into "Bloody Sanatorium", unexpectedly discovering that her gentle and considerate boyfriend Lu Yan was actually the ultimate BOSS. Because he hid his identity, Lin Xiaolu left in a huff, while Lu Yan disguised himself as a player to protect his wife. Facing teammate betrayal and eerie manhunts, she grew from cannon fodder into a strong warrior daring to fight and protect, and together with partners reversed time and space, stopped the sanatorium fire, rescued Lu Yan's parents, and healed his trauma of being trapped for many years. After the dungeon closed, Lu Yan sacrificed his power to return to reality, and the two reunited and got engaged; the game opened once again, and they joined hands with partners to rush into the next adventure.