Huh? I'm on prologue did xinlu and ilay really? Really? Fucked??!!!

Yepp, a long time ago before taeui came into picture

As the prologue says, he did it so that ilay wouldn't touch taeui. And taeui would only see xinlu.

Ypu mean before gable, since cinlu slept with ilay to get him away from taeui (not his smartest move)

Oh yes I meant before gable