Fei Yin glanced at Lei Qing who stumbled upon the truth. As soon as Dong Cheng left, Fei Yin has already guessed that Dong Cheng has many heavy things to bear. Thus, Dong Cheng chose to remain silent and then die along with his father and fellow disciples.
As soon as Dong Cheng had finished confessing to Lei Qing, Fei Yin has guessed that Dong Cheng was already prepared to die even before he confessed to Lei Qing. Him confessing to Lei Qing was only so that he won't leave any regret in his life. Thus, confessing his feelings to Lei Qing is just an icing on the cake.
"Bai Tan." Fei Yin called as he looked at the fluttering Shapeshifting Blanket.
Bai Tan, the Shapeshifting Blanket, swirled in the air before it flew towards Fei Yin and slipped inside Fei Yin's sleeve.