Sangtae and his teenage daughter Doyeon are constantly arguing and haven't had a genuine conversation in years. When their souls are switched by a magical force for seven days, they must learn to tackle the awkward and unfamiliar situation in each other's shoes.

The bear man who was once a bear become human by eating garlic and mugwort for 100 days. One day, after retirement as a policeman, a terrorist brings the deadly virus and he looks exactly the same as the bear man! With help of a detective and Youtuber, he tries to save the world now.

Old age is an inevitable future for every human being. But these four old men are not willing to succumb to time or the younger generations; they are ready to make their own decisions and overcome any obstacle. They try to live the rest of their lives to the fullest and achieve life goals.