心里装着怪兽嘴上硬装温柔
[xīn lĭ zhuāng zhe guài shòu zuĭ shàng yìng zhuāng wēn róu]
With the English meaning of 'Monster Inside, Feigning Gentleness Outwardly', this user seems to be conveying the conflict between their inner turbulence or strength and external demeanor of kindness or calmness. It could highlight an internal struggle, or suggest someone protective but fierce, who maintains social grace despite inner turmoil.