I know that there are already sooo many comments, a lot are very interesting tbh, but I wanted to share my thoughts…
i think Jai was after Teh all along. I somehow think he manipulates situations. Like him kissing his teacher. I think he wanted Teh to see him kissing so he could be more desirable and after that he wanted him to have sex with Oh but he puts himself in his mind for telling him that he can remake their first sex again. Obviously Teh was thinking about Jai that night. In the morning Oh said that was like their first. It was so sad :( I also think he deliberately leave his bag open for Teh to see plum wine so that they could drink and talk more. And that kiss at the end, was not for the play. Jai you can't deceive me honeybunny.