YAT has caught “POLICE HEADACHE”. His courage and quick-wittedness, as well as his exclusive about “POLICE HEADACHE” win the applause of his colleagues. PO applies to transfer to the Tango Team. HAP joins her for fear she would pick up a fight with MIKI. YAT sees his late father’s wooden box as he is helping OI move. HAP makes him open the box with a trick. When he opens the box, he finds a set of stamps on Lunar New Year animals. He believes it was a tactic of his father to plead for his forgiveness. According to OI, their father used to write to him often but YAT does not believe her. HAP goes to YAT’s old apartment for a look. She rushes to the refuse collection point at once when she knows that the new landlord has just thrown away YAT’s old letters. As YAT is reading his father’s letters, he comes to know the reason why his father left home. He thanks HAP, but they soon quarrel over the way he handles news. KIU sees the letters……