Twenty years ago, Zhou Tuohai was abducted by human traffickers but was rescued and adopted by his foster mother. His biological parents searched for him for twenty years, but they kept missing him. The first time his biological parents recognized their son, his foster mother appeared at that moment. Not wanting to disrupt his current happy life, his biological parents gave up on the reunion. However, their son did not give up and, in the end, recognized them by the scar on his hand.