i think it was a bit crazy that he did that lol but i think it’s just because of all the built up frustration. seoan just gave up his entire life, family, and future because the person that he loves gave him the healing and courage to do so. While that same person (woowon) is running away and hiding from him. literally. he’s also hiding the issues that he’s dealing with from seoan which is making seoan feel helpless in helping his lover who did the same for him.
seoan reached his boiling point and went to knock some sense into woowon i guess

I stll do not understand why didd he hit Seo-ah, it just doesn't make any sense to me.
Any thoughts on this?