Mathematics is everywhere. This course aims to provide an understanding of the link between mathematics and daily life in areas such as social and biological sciences. In the course, we will describe the roles of mathematics in voting, coding, and biology. Through some surprising examples, students will understand how powerful mathematics is in their lives. The mathematical tools we will discuss in this course include the basic concepts of probability, number sequences, graph theory and logic, but students are not expected to have any prior knowledge of these topics. To enhance the learning experience, mathematical examples from some films and dramas will be discussed during the course. Through group projects related to daily life, students will extend their views from abstract theories to concrete examples, and discover that they cannot live without mathematics.