Se-ra, La-mi and Kwang-soo have an inexplicable relationship. They can be considered family members, but they can also be considered strangers. They are burdened with a debt crisis of 100 million yuan, but they live an enviable life every day, and they are always worried. One day, they heard that the diamond "Suni" worth 5 billion yuan was missing, so they united and vowed to find the diamond. Unexpectedly, this legendary diamond changed the fate of the three people. In addition, another group of people is also looking for the whereabouts of "Suni". In the end, who can get this magical diamond?