A grand mansion in the heart of the city. Cornell, the servant who has raised the Barnett brothers like his own, is shaken when he realizes that at some point he began seeing them not as children, but as men. On the brothers’ twentieth birthday, he resolves to leave the mansion behind. Yet just as he departs, after one last warm farewell, Cornell collapses—and awakens to find his body changed in ways he cannot explain.

"From now on, the three of us will be together in this mansion forever."

Original Webtoon