明月魂魄化体温成冰
[míng yuè hún pò huà tĭ wēn chéng bīng]
Using imagery from nature ('moon'), this nickname refers to the act of turning one's soul/essence and body temperature into ice - suggesting a cool exterior hiding deep, possibly passionate emotions inside, symbolically representing a complex personality. This also alludes to ancient Chinese folklore and romantic ideals about cold hearts.