就算是你的背影我也认识
[jiù suàn shì nĭ de bèi yĭng wŏ yĕ rèn shī]
Translated as 'Even if I only see your back view, I would recognize you', it suggests that this person can recognize someone they are familiar with even without seeing them clearly face-to-face, conveying a sense of strong recognition or memory.