One is a bullied, overweight, and weak-willed worker who has lost all hope in life. The other is a brilliant and courageous warrior, devoted to protecting his country yet yearning for an ordinary life. A twist of fate causes their souls to swap after the worker learns the devastating truth—his mother's death was caused by bullies who withheld her medical expenses. From that moment on, a fearless and unyielding soul resides in a once-fragile body. Watch as the warrior takes on the corporate world, punishes wrongdoers, and reclaims life with wit and strength!