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Serious about corporate life, Kim Nak-su sets his sights on upward mobility — but finds himself weighed down by favored juniors and office politics.

Nak-su's ruthless ambition breeds tension for those around him, including his family. Soon, a sudden corporate scandal makes him HR's target.

Nak-su's corporate disaster worsens as he scrambles for damage control — forcing Baek Jeong-tae to make a decisive choice about his career.

Forced into a career crisis, Nak-su tries to make the best out of his situation. But he soon faces Jeong-tae — who delivers a momentous blow.

Now officially demoted, Nak-su agonizes over a daily grind that feels punishing. But just when he can't take it anymore, he finds a glimmer of hope.

Nak-su, full of new energy, pushes to return to headquarters. Meanwhile, his family faces changes unfolding in their own lives that test their bonds.

As Nak-su's behavior grows erratic, he manages rising employee anxiety amid a concerning company-wide notice — forcing him to make a bold decision.

As Nak-su tries to adjust to his bleak new reality, he searches for ways to get back on his feet — betting everything he has on a risky new venture.

Even as stress takes a physical toll, Nak-su hides his struggles from those around him — enduring humiliation to survive and keep up appearances.

When the truth comes to light, Park Ha-jin confronts Nak-su over betrayal. While apart from his wife, he finds courage to contact his estranged brother.

Nak-su's pride crumbles as he endures humiliating moments at his brother's workplace. Then Baek Jeong-tae reappears — with an irresistible offer.

With peace in mind, Nak-su returns to his old company in a completely new role — standing tall before his former colleagues with renewed pride.