Overview: YUNG blames himself as he thinks that TUNG killed herself for him. CHIT receives a call from the traveling agent and learns that TUNG had reserved a seat in a flight. It seems that she did not kill herself. YUNG investigates the case. YUNG receives information of HELEN. He goes to Kam Tin to find her. TIN sees HELEN and follows her. CHIT also follows them. In a deserted house, CHIT hears a gun shoot. TIN is hurt. CHIT roughly sees YUNG having fired but she is not certain. TIN is in a comatose. KWAN worries much. YUNG finds that CHIT was at the scene. A beggar TO was also there. He heard conversations and the gun fire but he did not see the people.