Gragon and basement!
I don't know how underrated this is but it's my current favorite novel. Hako no Naka. http://9th-ave.blogspot.com/p/test.html
http://www.mangago.zone/read-manga/prime_minister_in_disguise/
http://www.mangago.zone/read-manga/thirty_years_old/
http://www.mangago.zone/read-manga/film_emperor_s_reincarnation_script/
http://www.mangago.zone/read-manga/don_t_leave_after_school/
http://www.mangago.zone/read-manga/psycho_young_dream/
any underrated manga/manhwa/novel, anyone? recommend me some idc about the genre thank you so much