Wei Sa is the eldest son of the prestigious Wei'an Royal Mansion. He is Lu Gan's first fanboy, having been rescued by Lu Gan from a river where he had been drifting unconscious for days. He values loyalty deeply and couldn't stand by and watch his savior be mistreated. He was furiously scolding Mistress Ling Yun for making things hard for Lu Gan by ordering him to pour hot water into a running stream. He offered to take Lu Gan into the Wei'an Royal Mansion and treat him like his own brother. When he encountered Su Baiyue, he was flustered and stammered, his face flushing bright red. He frantically added wood to the fire in embarrassment. He was dragged away by guards after Su Baiyue ordered him to be thrown out.
