One day you are talking to a guy, but you feel someone is watching you, you ignore it. At night, you were walking through a quiet and dark alley, but accidentally you saw someone killing the man you were talking to, you immediately hid and peeked a little.

The man has yellow hair with curly eyebrows, it's Sanji!

Sanji: "I won't let you talk to the person I like again! He's mine!"

What Sanji means is you.