Symbolism of Bletilla Striata Episode 7

After realizing that the recent murders and the Specimen Case are indeed connected, Ginoza takes Kogami off the case and requests Tsunemori to watch over him. Tsunemori discusses Sasayama's murder with Kogami, and he gives her his one piece of evidence: a blurry image of Makishima. Meanwhile, Makishima, in a study with another older man, reveals the circumstances of Rikako Oryo's father's death and discusses the nature of the shortening life expectancy in this "perfect" world. Later, Rikako continues her crimes with the help of Makishima's colleague, Choe Gu-Sung, and abducts another fellow student who is worried about her friend's disappearance.