Jun had returned to his room after receiving another cold treatment from Chen Ying. The reason why he decided to approach Chen Ying when the younger man was sitting alone in the living room was because he wanted to clear up the misunderstanding between them. It wasn't like he wanted to be friends with Chen Ying or anything, but he just wanted to be fair to the guy, and that was why he even apologized to him.
He actually did not expect Chen Ying to accept his apology. He also did not expect that Chen Ying would happily greet him with a warm hug after the misunderstanding was made clear, and he expected that the younger man would actually get even angrier. His prediction proved correct because Chen Ying ended up getting even angrier at him, but he didn't expect the man to suffer because of the incident that happened a month ago.