情丝百转丝丝缠
[qíng sī băi zhuăn sī sī chán]
Threads of love weave and intertwine countless times. Similar to '情思百转犹不知', this suggests emotions are deeply entangled and complexly interlaced. Here, '丝丝缠'(sī sī chán) specifically refers to each thread (of emotion) being intertwined.