Third update!
Chu Renkuang only thought of him as the Divine Doctor who had saved Chu Qingxue and, to repay the favor, wanted to engage Chu Qingxue to Yi Buxing's descendant. Yi Buxing didn't actually have any descendants, but he took on the engagement for his disciple. Later, he took in the comatose Ye Chenfeng as his disciple, and the engagement naturally shifted to Ye Chenfeng.
Both Chu Renkuang and Chu Qingxue had no idea that Ye Chenfeng was the very person whom Chu Qingxue had saved through a blood transfusion. At that time, they hadn't even seen each other's faces.
From that time on, Ye Chenfeng became a shadowy figure, always guarding Chu Qingxue. It wasn't that he didn't want to face Chu Qingxue as his true self.
But he had already caused Chu Qingxue to drastically change, and he felt like a bloodstained executioner, a war machine. He simply didn't consider himself worthy of Chu Qingxue, the kindest girl in the world.