“什么是死亡?”这个问题对于刚失去哥哥的小孩子生生(吴至璿 饰)来说可能太难回答了。他拿到了哥哥的手机,发现他一直在关注一个网络直播,名叫“活过一百天”。这个直播间的明星一位叫莉莉(鲍起静 饰)的老奶奶。老奶奶被诊断出肺癌晚期,但是在很努力地生活,且已经超出了医生的预期。这两人将一起去探索到底什么是死亡这个问题……Sen's brother passed away. When Sen goes through his brother's stuff and finds out that he's been following a granny's livestreams. The granny has only 3 months left to live, and decided to enjoy the 100 days as she pleases. Granny drives her old cab wherever she wants and livestreams her journeys. Both facing death head-on, Sen and Granny builds a bond through the Internet, while time is ticking away.