Wu Yifan sheds his past for Kris. Zhang Yixing is forced to be Lay. 

At 21, Kris kills Zhang Yixing.

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Set in the Labyrinth and Prolepsis canon! You don't need to read both to understand but you can find some of the scenes in Labyrinth so it might help!

Labyrinth: http://www.asianfanfics.com/story/view/161218/labyrinth-2pm-action-angst-hoya-infinite-junho-korean

Prolepsis: http://www.asianfanfics.com/story/view/276766/prolepsis-sequel-to-labyrinth-dongwoo-hoya-infinite-yadong