newcomers turn low at night

An angelic new employee by day, a different person by night. Three months into the job, the handsome, well-mannered newcomer turns out to be the chairman’s son.
But it wasn’t just his identity that was deceiving. His personality…his personality is terrible!
“Good morning, Ms. Shin.”
The sweet and cheerful newcomer in the daytime.
“Take care of it by tomorrow.”