鬼門關

Ghost or spirit of a dead person; devil; a person with a bad habit or vice; sly or crafty; a name for one of the ancient Chinese constellations.

Door; gate; entrance; opening; family; lineage; school of thought; sect; key point; method; classifier for courses or fields of study.

mountain pass; to close or shut; to turn off; to concern or involve; to confine; to collect or receive; surname.