Businessman Singer is a fictional character portrayed by Hisato Masuyama in the TV series Castle.
They appear in 1 episodes out of a total of 173 aired
Episodes1
The Way of the Ninja
episode S6.E18 march 2014Investigating the killing of a Japanese ballerina, Castle and Beckett find a shrine with the murder weapon in an old factory. Then, when the two are separated, Castle is ambushed by a hooded attacker bearing all the hallmarks of a ninja.