Hogwarts: Undercover Death Eater Replaces the Dark Lord

There are three rules for being an undercover agent:
First, never act on impulse!
Second, absolutely achieve the mission objectives!
Third, you must never fall in love!
Lycos couldn't do any of this.
As soon as he traveled to Hogwarts, he found himself an undercover agent planted by the Death Eaters in Hogwarts.
When he finally gained Voldemort's trust, a group of people suddenly came to tell Lycos that he was actually a secret agent planted by Grindelwald's witch party next to Voldemort.
Lycos: “…”
He finally realized that being an undercover agent had no future.
Magic is power, and there is nothing that a killing curse cannot solve.
If so, two shots!