"Lifemark" is a heartwarming drama about a young man named David who is adopted and living a comfortable life with his adoptive parents. His world is suddenly turned upside down when his birth mother, Melissa, reaches out to him. Melissa, who had given David up for adoption when he was a baby, is now struggling with a terminal illness and wants to meet her son before it's too late.
David is apprehensive about meeting Melissa, but his curiosity about his birth mother and his desire to know more about his past eventually lead him to agree to meet her. As David gets to know Melissa, he discovers that she has a deep regret about giving him up and is hoping to make amends for it. Along the way, he also discovers the truth about his adoption and the reasons why his birth mother gave him up.
Despite initial difficulties, David and Melissa gradually develop a close relationship and explore their shared interests and passions. During this emotional journey, David also learns the true meaning of family and discovers that the people who love and support him are the ones who matter most. The movie ends on a heartwarming note as David realizes that there is room in his life for both his adoptive family and his birth mother, and that both have played an important role in shaping the person he has become.