Character A is a world class spy and is given a mission that can determine world peace. They need to get close to a specific politician and figure out what he's planning, and if it's anything dangerous that could spark war, they have to put a stop to it.

But there's one issue: The politician only goes to social events that are for their kids, meaning that A will have to get a spouse, a kid, enroll the kid into this prestigious academy, and get them to be a straight A and well behaved student so they can become and elite, and therefore attend social gatherings.

So A has no choice but to start a family.

They go to an orphanage and adopt a child named Character C. Turns out C is a telepath, but keeps it a secret so they won't get abandoned/dumped at the orphanage again,

Then they secure a spouse, named Character B. B however, is secretly an assassin. They had been training since a young age to support them and their younger sibling, but even their sibling has no idea about their secret job. They agree to marry A so they aren't considered suspicious and be accused as a spy, so they don't know A's true motives.

And so, this family has to pretend to be a perfect loving totally normal family for the sake of world peace.