Some things look hard but are simple to do.
Some things look simple but turn out to be hard once you try.
Difficulty and simplicity are relative—just concepts, nothing more.
For Yuri, one phrase might be more fitting:
"Hard for those who don't know, simple for those who do."
Launching a one-man assault on a billionaire's family-with-many-bodyguards might seem hard, but Yuri was simply here to finish the job.
Yuri approached a bedroom, a room that, most of the time, was occupied.
He pushed open the door. The bed was empty, but the state of the bedding showed it had been recently occupied.
Each room was a suite, with a bathroom and a walk-in closet—standard for a villa designed to house many people.
However, the people inside didn't have a chance to leave. So, they were still here, just needed to be found.