It seems to me that he is changing quite a bit, but still has many secrets behind him that Dae doesn't know. Which is quite suspicious, but if he says that dae can ask him anytime, it means he's not fully just keeping it himself. He's still quite bad but he isn't the worst ML I've seen in a manga with this genre before, so I am hoping he changes for the better someday.
It seems to me that he is changing quite a bit, but still has many secrets behind him that Dae doesn't know. Which is quite suspicious, but if he says that dae can ask him anytime, it means he's not fully just keeping it himself. He's still quite bad but he isn't the worst ML I've seen in a manga with this genre before, so I am hoping he changes for the better someday.