The New Employee is Incredible?

A strange old lady appears before the 31-year-old protagonist, who graduated from a provincial university, has no connections, and no impressive credentials!
“Buy one for me…”
The old lady suddenly thrusts a piece of gum forward, claiming that chewing it will make you smarter, better at work, and even more likable.
The protagonist, caught off guard, ends up buying it. During a job interview, He absentmindedly swallows the gum, and from that moment on, things start to strangely go His way…