INCLUDES (not limited to): systems, op mc, towers, dungeons, reincarnation, time travel/reverse time, school, medical, sports
DOESN'T INCLUDE: cultivation (bc i make another list for it), ROMANCE
Threw a bunch of manhwas that I have read a long time ago till now together in here, so some might not fit the description
HERE'S THE LINK TO PART II OF THIS LIST! PLEASE CHECK IT OUT:
https://www.mangago.me/home/mangalist/2573656/ 
Messages
You need to look over your playlist again because some even have to romance tage and it's still here
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Hi, some of them do have romance tags but when I read them before they had little to basically no romance or the little romance did not take away from the story. For example, although A Returner's Magic Should Be Special says it has romance tag, when I read it before, it had little to no romance and the little romance did not take away from the story. Also, some of them I have not caught up to for a really long time, so if it does have romance in them I apologize in advance. However, if there is a specific one that you want me to take away feel free to let me know so that I can look it over and take it down! Thanks! (●'◡'●)ﾉ