Okay actually here a big ass list of stories i recommend:
https://www.mangago.me/read-manga/the_urban_legend_files/
https://www.mangago.me/read-manga/suiheisen_no_nella/
https://www.mangago.me/read-manga/mata_onaji_yume_wo_mite_ita/
https://www.mangago.me/read-manga/morimite/
https://www.mangago.me/read-manga/waltzing_at_sanzu_river/
https://......
When hyeonseo realizes what he missed in the form of the ML he will try to comeback but when he gets swapped he will end up suffering lmao, the ML will act true to his psycho persona