Synopsis

A mercenary named Shin Youngmin faces the wrath of his boss, Kim Hyunsung, for ignoring warnings and getting involved with a dangerous client. He pleads for mercy and is given a month to "endure" a vague punishment. Meanwhile, a school teacher witnesses the aftermath of a brutal fight and manipulates the situation to protect Kim Hyunsung from being linked to the violence and to maintain order, threatening to expose others' misdeeds if they reveal the truth.