I got addicted after reading quite a few of them <no romance, no harem>
http://www.mangago.zone/read-manga/rooftop_sword_master/
http://www.mangago.zone/read-manga/the_live/
http://www.mangago.zone/read-manga/trapped_in_a_webnovel_as_a_good_for_nothing/
http://www.mangago.zone/read-manga/bug_player/
http://www.mangago.zone/read-manga/kill_the_hero/
http://www.mangago.zone/read-manga/max_level_returner/
http://www.mangago.zone/read-manga/eleceed/
http://www.mangago.zone/read-manga/the_strongest_florist/
http://www.mangago.zone/read-manga/the_descent_of_the_demonic_master/
http://www.mangago.zone/read-manga/sss_class_suicide_hunter/
http://www.mangago.zone/read-manga/ranker_who_lives_a_second_time/
http://www.mangago.zone/read-manga/mercenary_enrollment/
http://www.mangago.zone/read-manga/crimson_karma/
These are famous, kinda ^
http://www.mangago.zone/read-manga/metamorphosis/
http://www.mangago.zone/read-manga/there_was_a_hero/
http://www.mangago.zone/read-manga/spy_x_family/
http://www.mangago.zone/read-manga/arcane_sniper/
http://www.mangago.zone/read-manga/villain_to_kill/
http://www.mangago.zone/read-manga/return_of_the_frozen_player/
http://www.mangago.zone/read-manga/bastard_hwang_youngchan/
http://www.mangago.zone/read-manga/taming_master/
http://www.mangago.zone/read-manga/incompetent_villain/
http://www.mangago.zone/read-manga/real_man/
http://www.mangago.zone/read-manga/movies_are_real/
http://www.mangago.zone/read-manga/gang_of_school/
http://www.mangago.zone/read-manga/i_alone_have_genius_dna/
http://www.mangago.zone/read-manga/level_up_alone/
http://www.mangago.zone/read-manga/poison_dragon_the_legend_of_an_asura/
Not very famous^
Sfhesttwywhsie I don't remember the names-