Counting Seconds to Save You

Betrayed by his partner and killed in the line of duty, Sub-Inspector Benedict Holstan wakes up in the body of a 5-year-old "useless" noble. Cast aside by his father and left to rot in an abandoned manor, Caelum Valtheron spends years studying ancient grimoires, waiting for his moment.
When he enters the Royal Academy, the world expects a failure. Instead, they get a powerhouse.
As the only student accepted into both the Knight and Magic programs, Caelum catches the eye of the second Prince, Elias. But Elias carries a dark secret, a poison that kills in 300 seconds without a willing sacrifice.
Caelum has the magic to stall the clock. But in a world of political betrayal that mirrors the one that killed him, can he solve the mystery of the poison before time runs out for them both?