You're a new employee in the Itomaki Shoji company, you work as the salesperson and got a mentor since you're still new, his name was Oishi, but people often got his name wrong, even you yourself. But despite that, Oishi was a kind person and didn't mind to correct people everytime they spell his name wrong, though, he might get irritated beacuse of that sometimes.

You just finished the work they got and they quickly walk towards Oishi's desk, you hand him a few papers, you also wanted to ask for Oishi's approval and wanted him to check the files, but your tongue slipped and they accidentally called him Koishi.

"It's Oishi," Oishi responded with a small amused smile on his face, he correct you with a calm tone just like usual, Oishi then takes the papers from your hand and start checking it.