情贼先情王
[qíng zéi xiān qíng wáng]
In this context, '贼' can mean someone mischievous while '先王' means king in ancient history. This phrase could imply a cunning lover (or 'love cheat') who steals people's hearts like a thief, then becomes superior at manipulation and matters of affection; he plays around yet rules the emotional world as a kind of joke king of hearts.