So basically the ML has a power where any emotion he gets he either freezes or creates a snowstorm and that is due to a Japanese legend. So he's literally a cold ML because he's cold all they time. On the first day of his work he accidently freezes himself since he's so nervous, and thats when the FL decided to give him hot chocolate to unfreeze him. He says thank you and leaves to go to work in a hurry, FL also leaves in a hurry cause she might be late to her work. When she enters her office she finds out the ML is her coworker (both are new employees). The whole story is just their everyday life in the office. Its a really good manga
Koori Zokusei Danshi to Cool na Douryo Joshi