Forbidden Guide

Boxer Zane must seduce his zombie stepmother after a death-defying kiss activates a conquest system.

Zane, a former boxing king, scavenges a corpse mountain for water until a red-haired SSS-Rank Zombie Queen captures him. He survives by stealing a kiss, which activates the Goddess Conquest System and brands the undead ruler — his stepmother Scarlett — as a mandatory target. Now confined in the Oasis stronghold, he must navigate a deadly seduction while his stepsister Mia crashes into the chaos and Vela, the chief scientist and his former high school teacher, complicates matters further.

• post apocalyptic
• romance
• fantasy
• harem

1. Zane was a boxing champion
2. Kiss triggers Goddess Conquest System
3. Target is stepmother Scarlett

This fits viewers who want apocalyptic romance with taboo family dynamics and game-like progression.