All Luhan had to do was take care of a boy (who suffers from more than one medical condition, it seems) with one hell of a wild (and vivid) imagination who also claims that he has the abillity to give life to his drawings, and only his drawings. Luhan takes this as a sign of mental illness or condition but when Lay tells him things of life that Luhan would never expect from an 'insane' person, he starts to doubt Lay's insanity.