@Ur mom He is too obsessed with him to kill him. Here, people need to understand till now we saw Taeui's pov. Not Ilay, we don't know how he feels about him He is just another Taeju and Keith, that's all I am saying now.
I read some of the dialogues of Ilay and Zenya of Code name anesthesia and those dialogues will only come out of a mouth who is in love.