The New Employee Is Incredible?

A strange old lady appears to the 31-year-old protagonist who graduated from a local university and has no connections or qualifications. The old lady suddenly offers him a piece of gum. She says that if you chew it, you will become smarter, do well at work, and even be liked. The protagonist accidentally buys it and swallows the gum during an interview, and strangely, things go well for him from then on... Source: MU