Dong Il is the coolest old man in his 70s. He cooks using a tablet PC and knows how to use SNS. He knows how to enjoy life. But one day a crisis occurred. His son went to the United States to remarry and lowered his son with Dong Il, whose life was anxiously shaken by his teenage grandson who did not suit him. When crime against parents is done, both of them pair up to get to the bottom of the mystery
Dong Il’s grandfather and Jae Hoon’s grandson are in a gloomy condition when crimes occur against parents in the village. Dong Il hopes nothing will happen to him but he is a target too. Jae Hoon departs to help Dong Il and Dong Il suspect Jae Hoon’s friends.