"A lively and always grateful new employee, Min Kyung-jin.
It was the moment he dreamed of a routine office life after joining the top consulting firm <A&Z>.

'Again.'

But the boss he met was Jung Joon-woo, the workaholic head of the Emergency Strategy Planning Team, nicknamed 'Hades.'

'You call this trash a report?'

Joon-woo, who sees people as tools and relentlessly criticizes with aggressive remarks, ends up being the only one left on the team.
Everyone feels sorry for Kyung-jin, who has to endure such a boss as his probationary senior—

'Yes! I’ll do it again!'
'Sorry! I’ll fix it before leaving work!'
'Is this wrong too? I’ll correct it right away!'

But suspiciously, Kyung-jin has an energy that even the King of Hell can’t break...?

An unlikely duo who seem like absolute opposites.
As various incidents unfold around them, they find themselves drawn to each other in an unexpected way!

The sweet and eventful office romance drama of Joon-woo and Kyung-jin—no, —begins!