守着一个笨蛋卫着一个傻瓜
[shŏu zhe yī gè bèn dàn wèi zhe yī gè shă guā]
This expresses an affectionate and perhaps ironic or playful devotion to someone considered silly ('idiot' or 'fool'). It implies staying by and defending the person they care about despite their perceived foolishness.