HON-TO leads the CIA Agent, KIM SAU-KEI, to inspect the headquarters of the SDU, during which they talk about several mysterious cases that happened over the past years. Among them, KIM SAU-KEI seems to be exceptionally interested in the case involving ON TIN-MING. After CHEUK-YUEN expresses that he would like to return to the SDU, HON-TO arranges for him to undergo an assessment. CHEUK-YUEN goes to the hospital to accompany WAI-WAI. Reflecting on the past, he cannot help feeling his sadness that is brimming over. For the sake of his family members' safety, CHI-LUNG pushes WAI-YAN into cooperating with him to find FURY CHICK. When HON-TO and his fellow team members raid the unit where illegal weapons are stored, WAI-YAN informs CHI-LUNG on the whereabouts of FURY CHICK. Surprisingly, WAI-YAN learns that KIM SAU-KEI and ON TIN-MING were actually childhood friends……