On March 2014, the Sunflower Student Movement broke out in Taiwan in protest of the Cross-Strait Service Trade Agreement（CSSTA）after the Economic Cooperation Framework Agreement（ECFA）was signed just 4 years prior. The Sunflower Student Movement signified a shift of public opinion in Taiwan. Meanwhile, in 2012, Xi Jinping took the office as the new leader of Mainland China. In a different environment with new challenges, Xi has different policy priorities from his predecessor. In this paper, I employ a two-level game model to analyze how the change in Taiwan's public opinion indirectly influences Taiwan's diplomatic policy. I also use the cross- Strait relations as an example to illustrate that when Taiwan’s new public opinion and Mainland China's new leader both change in the same direction, for example, with Taiwan's sovereignty issue as a common focus, a big conflict may break out. However, if they do not share a common focus, even at the expense of cross-Strait relations deadlock or backtrack, both sides would be satisfied with a new situation.