What is death? This may be a tough question for a young kid like Sen-Sen who recently lost his brother. On his brother's mobile phone, Sen-Sen discovers that his brother was tracking an old lady's live streaming. Lily is the star of the webcast, an immigrant cab driver diagnosed with stage four lung cancer, only given 3 months to live. But she's striving to live longer than she’s allowed. An Internet line connects Sen-Sen and Lily and their friendship gradually deepens. But the 100-day time limit is getting closer and the two will figure out the answer to the previous question together.