Regressor Instruction Manual is a deeply cunning and morally flexible fantasy manhwa that explores how a manipulative mind can become the most dangerous weapon. The protagonist is summoned to a brutal world of monsters and adventurers, but unlike the heroes he sees, his talent level is rock bottom, and his stats are pathetically hopeless. To survive in a party of powerful, troubled individuals (including a regressor), he realizes he cannot rely on strength or magic. Instead, he weaponizes his greatest talent: understanding human psychology and exploiting it ruthlessly. Whether he has to lie, manipulate, or orchestrate chaos from the shadows, he will use everything and everyone around him to ensure his own survival. Often compared to the scheming tone of The Greatest Estate Developer and The Trash of the Count’s Family, this manhwa is a breath of fresh air for readers who love an intelligent, scheming protagonist who wins through wit and social maneuvering rather than raw power.

Keywords: Regressor Instruction Manual manhwa, manipulative protagonist webtoon, psychological survival fantasy, using allies for survival, schemer main character, low stats strategy story.

Meta Description: With rock-bottom stats in a world of monsters, a man decides the only way to survive is to manipulate his powerful regressor allies in Regressor Instruction Manual.

Alternate Titles: Regressor Instruction Manual / 회귀자 사용설명서 / How to Use a Returner