To write a story that could make the audience shed tears is a challenge for many authors. In brief, the keywords are three: character, plot, and your insight. Introduce your main character. What is his dream, weakness, struggling, etc. Tell your audience in smooth detail. I mean, make sure they read/watch real people with real problem. Secondly, the plot. Start with an alright condition. When everything seems fine and suddenly something drastic happens, your audiences aren’t so prepared, they’ll empathize. Last, read as many sad movies or novel as you can to give you best insight about how to touch the audience’s emotion.