Jhin plays a part in Shen's and Zed's lore

When taunting Zed or Shen to “You helped lock me away, you tried to stop my work, my art cannot be contained” “I remember your father, he thought he could censor me” “Your father was a merciful man, only his failure will be remembered” “I have been planning your final performance, for a very. long. time.” . . . . . to “You were wrong to kill your master, I needed him for this performance” “You wanted to kill me back then didn’t you? You will learn, art cannot be killed”

now jhin's lore: Once an Ionian prisoner, but freed by shadowy elements within Ionia's ruling council

I have a feeling jhin has something to do with zed and the box he opened in the temple