I know he maybe didn't say it in exact words, but Seoin didn't say I liked you back to YW again. And they also didn't talked about Seo-in step brother. And YW also never told about the bullying issue.
Which can still lead to YW thinking that "maybe I was being selfish about liking Seoin..." I still bet 99% that the ending for season 2 will be the chapter 1, with Seoin running toward the exact place (I think that place is the place where they are first reunited), finding YW already left.
I know he maybe didn't say it in exact words, but Seoin didn't say I liked you back to YW again. And they also didn't talked about Seo-in step brother. And YW also never told about the bullying issue.
Which can still lead to YW thinking that "maybe I was being selfish about liking Seoin..." I still bet 99% that the ending for season 2 will be the chapter 1, with Seoin running toward the exact place (I think that place is the place where they are first reunited), finding YW already left.