居心何在

jūxīnhézài
  1. What's (he) up to?
  2. What's the motive behind all this?

CEDICT

Entry Composition

1 居心 jūxīn
  1. to harbor (evil) intentions
  2. to be bent on
  3. a tranquil heart or mind
2 何在 hézài
  1. where?
  2. what place?