Inclusion Criteria:  i. 19 years or older  ii. Patients who signed the informed consent form  iii. The clinical trial protocol can be complied with at the discretion of the investigator  iv. Performance status (based on ECOG) less than 2 (0, 1)  v. Patients with life expectancy greater than 3 months  vi. Condition in which primary cancer is controlled  • Definition: A condition that has not progressed at the time of review of clinical trials after curative treatment of primary cancer 3 months ago  vii. Number of metastatic lesions up to 5  viii. 3 or less metastatic lesions in one metastatic organ  ix. Those who are undergoing targeted therapy or chemotherapy can also be included (during radiation therapy, drug treatment is stopped)  Exclusion Criteria:  i. Serious medical complications that cannot proceed with radiation therapy  ii. Previous radiation therapy history at the location where radiation therapy is to be performed  iii. malignant pleural effusion  iv. When the spinal cord and the tumor are close (the tumor is located within 3 mm)  v. In case of brain metastasis requiring surgical intervention