180 degree longitude passes through us is similar because the show is about a mom, son, and family friends who are connected because of one person, the dad. The dad though in love with the family friends still married the mom and had a kid with her later on, the dad died leaving an empty son behind. The son digs through his dad's life through the little things that were left behind and finds out about the family friends and his feelings for the family friend grow. One da by accident he meets the family friends and spends a week with him and throughout that week his love grows fonder and him and his mom grow more and more parts as she realises that the man who took her husband is also taking her son.