There is a yellow phone in the CEO's office, a symbol of power and destiny.

The higher authority appoints a new CEO who is frustrated and easy to control, to head a company. There is a yellow phone in his office, the symbol of power and destiny, that gives him straight instructions, which he follows without a word. When he dies unexpectedly, a young, ambitious leader is appointed to replace him. When he wants to disconnect the phone, the higher management breaks him.—mrtanaka