Horizon (2017)

Lee Chi Ho is a science lover however he need to give up for his dream because of his family. He believes that the Earth is flat but he didn’t tell anyone about this weird idea. One day he meets a strange uncle who live in a mysterious spaceship and full of Flat Earth documents inside. Moreover, Lee’s son also believes that the Earth is flat but everyone in the school laugh about him, including the teacher. To prove what he believes for his son, he eventually decided to fly to the space with the uncle's spaceship.