报李投桃

Explanation: Meaning that he gave me peaches, plums rebate I him. Metaphor, or give each other something friendly exchanges. 　　Source: "Book of Daya suppression": "vote for me to peach, quoted by Li. 　　Examples: ~ Only hope that by looking after him worship the Buddha. (Ming Gao Lian, "The Jade Hairpin deceive Report")