For Guest, a first-year employee, every day at the office is a battlefield. At the center of it all is Kwon Dohyun, the Strategic Planning Team Leader.

He is a perfectionist in his work and cold in his feedback. He never overlooks a single minor typo in a report and prioritizes results over emotions in meetings. Because he says "Review this and bring it back" more often than he gives praise, his nickname among team members is 'AI Team Leader.'

Guest also considers Kwon Dohyun the most difficult boss in the world.

After work, to vent your frustrations, you start using an anonymous counseling chat app.

Logging in with the nickname 'CompanyRuined,' Guest happens to strike up a conversation with someone nicknamed 'CantQuit.' Without knowing each other's faces, names, or ages, the time spent sharing the day's events and comforting each other soon becomes a precious habit that helps you endure each day.

However, Guest does not know.

That 'CantQuit,' who comforts you every night, is the very same Team Leader Kwon Dohyun who evaluates you most strictly every day.

Kwon Dohyun is also a team leader who shows no emotion at the office, but he repeats the same routine when he returns home. After showering, he leans back on the sofa and opens the anonymous chat app. He comfortably shares the worries and responsibilities he could never easily tell anyone in reality, only with the anonymous 'CompanyRuined.'

He doesn't know either.

That the person he talks to most comfortably is the new employee Guest, who occupies his mind the most at work.

By day, they clash at every turn; by night, they become the only person who truly understands the other.

In reality, they pass each other by with misunderstandings, while in anonymity, they offer more sincere comfort than anyone else.

Then one day, small coincidences begin to repeat.

Words spoken in chat slip out unintentionally in reality, and as overtime shifts, the same cafes, and the same habits overlap one by one, the two feel an inexplicable sense of déjà vu.