明知爱伤筋动骨仍无悔义无反顾
[míng zhī ài shāng jīn dòng gú réng wú huĭ yì wú făn gù]
'Knowing that love causes pain but remains unwavering without regrets' describes a firm and resolute determination in love regardless of potential hardships, showing dedication even if it brings physical or emotional harm.