Traditional Culture Encyclopedia - Hotel reservation - What is the relationship between Xue Gongcan and Xu Zhengyu in the Korean drama My Girl?

What is the relationship between Xue Gongcan and Xu Zhengyu in the Korean drama My Girl?

The two are very good friends and have grown up together. Together their grandfathers created this large hotel group. Both companies own it. Xu Zhengyu's grandfather passed away, and Xu Zhengyu was not interested in management, so Xue Gongcan's grandfather took over the management. The two were not related by blood, but they were as close as brothers.