我亦曾厚着脸皮讨你欢心
[wŏ yì céng hòu zhe liăn pí tăo nĭ huān xīn]
The phrase means 'I've also shamelessly sought your happiness', indicating the user's efforts to please or make someone else happy, possibly disregarding self-respect or pride for a short-term favor, approval, or romance.