若火焰般热情若冰霜般无情
[ruò huŏ yàn bān rè qíng ruò bīng shuāng bān wú qíng]
It describes a personality trait characterized by 'Passion Like Flames, Indifference as Cold As Ice'. One side burns passionately when engaged but becomes indifferent and even cold-hearted once detached from it, showing strong emotions yet also a willingness to withdraw without feeling.