With some small clues, SHANG knows CHING is having an affair and greatly believes they are related to KIKI’s death. He wants to test CHING to tell the truth, but CHING strongly denies. SHANG at last reveals the affair of AMY and CHING, CHING admits he has killed KIKI by mistake, and SHANG advises him should go for self-accusation, but he escapes. SHANG reminds him to think carefully of what has happened in KIKI’ home that day. CHING gets the light suddenly and discovers the murderer of KIKI should be AMY. CHING makes a dodge to ask AMY to tell the truth, but unsuccessful. On the contrary, AMY puts all the responsibility on him. They argue with each other and CHING is so provoked that he loses control and goes crazy, he uses the cold steel to stab on AMY.