I personally think it's okay for him to think that Daeun is adorable. It's not cheating.
From Babi's perspective, he tried his best to prevent any misunderstandings from happening...
-I think that's cheating
-I personally think it's not cheating in the drama version. However, there was an earthquake in the cell's village. He was shaken and I somehow felt he was about to betray Yumi. It's different from the original webtoon, though. He was clearly cheating there.
-The thing is that he doesn't only see Daeun as adorable, there's something more than that. In conclusion, I think he cheated on Yumi.
-What happened in the original webtoon, though?ㅠㅠ
-He broke up with Yumi and dated Daeun. And then, they got married.
-I don't think that's cheating in the drama version. But I understand that Yumi wouldn't feel good about it.
-I only watched the drama, I haven't checked out the original webtoon. I personally think that's not cheating. I don't think Babi would do something like that.
-Yeah, you can already see from the way he couldn't answer Yumi right away...
-He could think Daeun is adorable but once Yumi noticed it, it became cheating.
-That's cheating
-Honestly, I think it became cheating once Yumi noticed it