Summary：The fourth season "Ace to Ace" is a variety show in Zhejiang Satellite TV, which is produced by Zhejiang Satellite TV Program Center and broadcast on Zhejiang Satellite TV every Friday evening in the first quarter of 2019. Each issue, according to different themes, uncovers the "ace guardian messenger" set up by the layers of barriers, composed of Shen Teng, Jia Ling, Huachenyu, Guan Xiaotong "ace family", interactive challenges with another team of theme guests. The core idea of this season's project is: practicing hard one way and one way, striving to be the trump card of the times. The "trump card family" composed of four MCs not only fully demonstrates their respective strengths and charms, but also develops their potential, learns new skills and shapes a positive, healthy, lively and upward "trump card spirit" in their interaction and challenges with different subject stars.