After Sunwoo's mother became the chairman's mistress, Sunwoo and Seungwook became a specious fake family when they were young. However, Sunwoo, who lived an indistinguishable life despite his best efforts, was unable to close the gap between him and Seungwook, a young man who was born with everything he needed. 5 years later, Seungwook, who had gone to the U.S to study, returned to Korea which then led both to reunite but Seungwook made a dangerous proposal to Sunwoo… “” Since we're not even real brothers, I'm offering something that will benefit the both of us,”