我是一个贼偷走你心的贼
[wŏ shì yī gè zéi tōu zŏu nĭ xīn de zéi]
This user adopts a playful or humorous approach by referring to themselves as 'a thief who stole your heart'. It expresses both the stealth and success in winning someone's affection in an intriguing way, indicating they've captured another's heart completely without them fully realizing it.