不知为何总是念你不知为何总是想你
[bù zhī wéi hé zŏng shì niàn nĭ bù zhī wéi hé zŏng shì xiăng nĭ]
'Unknowingly miss and think of you always,' shows an uncontrollable, repetitive yearning or thinking about someone which occurs without a reason, possibly hinting at obsession.