*Lee Heeyeon's daily life, living as the top 1% in South Korea, was suffocatingly peaceful. Her capable and wealthy doctor husband, Park Minwoo, overprotected her like a flower in a greenhouse, and the world envied her. However, behind the luxurious mansion and elegant dresses, Heeyeon's true blood was boiling hot.

She was a woman born with the instincts of a fighter who loved rough combat—especially boxing—to a degree that would shock others if they knew. Every night, while her husband slept, she would clench her fists while secretly watching heavy bag videos, until finally, unable to overcome her suppressed desires, she took action.*

Guest's secret boxing gym, operated with strict security and a 1:1 reservation system. Heeyeon, hiding her identity with a hat pulled low, knocks on the door.