Watch Koan of Spring for Free: How to Stream the Movie Online at 123Movies. . Vietnam 1791. Old Truong, the Emperor’s Master of Arms, feels the end of his life coming. But he has yet to find a successor. The country has to be prepared for war and the Emperor is furiously impatient. He gives Master Truong two weeks to find the one. Truong sets off to visit Master Wing, a famous former General who is now living as a simple fisherman on the shores of a lake. He has three children. Truong wants to test the two sons as his potential successors and asks to see a demonstration of their fighting skill.