再怎么心如钢铁也成绕指柔
[zài zĕn me xīn rú gāng tiĕ yĕ chéng răo zhĭ róu]
'Even Steel-hearted Becomes Tender Around You'. No matter how hard your will feels, it would soften around someone specific. It implies that no matter how tough you're on the surface, certain persons bring out your softer side.