作怪

(of a ghost) to make strange things happen / to act up / to act behind the scenes / to make mischief / odd / to misbehave (euphemism for having sex)

worker / workshop / (slang) troublesome / high-maintenance (person)

to do; to engage in / to write; to compose / to pretend; to feign / to regard as; to consider to be / to be; to act the part of / to feel (itchy, nauseous etc) / writings; works

bewildering / odd / strange / uncanny / devil / monster / to wonder at / to blame / quite / rather

variant of 怪[guai4]