18 Again (2020)

both of them have body change element, married couple, husband has the same age as their son, age difference

both leads end up going to their past selves. in 18 again, the male lead is transported to his past body and lives in the present day. In Reset Life, the female lead is transported to the past and lives in the past life.

Both are great dramas about second chances and having a second shot at life

The two dramas are faced with being the same age as his parents because of time travel. The two approach the family in all its aspects. And the lead meets love in his journey.