Kimi ga Mata Hashiridasu Toki 2019 (Japan), also known as Running Again is Japan drama premiere on Mar 2, 2019
Shota is on the run from the police after committing a crime. He sneaks into a home. An elderly lady Tae approaches Shota and mistakes him for her grandchild. Shota begins to live with Tae. A couple days later, Tae's real grandchild Kaori arrives. Shota and Kaori face each other.
One night, Shota and Kaori listens to the radio and hears a discussion about an old marathon runner. Kaori encourages Shota to participate in a marathon. (Source: AsianWiki)