Detective Conan S01 E558 The Death Mansion and the Red Wall (Grateful Invitation)

"One truth prevails."

Yamato and Euhara takes Kogoro, Ran, and Conan to a mansion. Euhara reveals that the mansion was owned by a rich man in the past. The man one day decided to search for five talented people and gave the five a room in the mansion until they have reached their dreams.