Here's my recommendation for non toxic manhwa:
Sign (Ker), Mr K's secret, hold me tight, Love shuttle, Oh my assistant, trap trap, on or off, the new employee, anti p.t, unromantic, a dog's way love, lack of love, inner beauty, heat and run, wedding plan for mr and mr, its not like that, 4 weeks lover, percentage of love, no love zone, stranger than friends, full volume, help me uncle, love plan, tell me you can hear it, Tenth times the charm, keeper of the pearl, room to room, window to window, dont pick up the soap, make me bark, my housemate, mayday mayday mayday, one more time sir, same but different, ring, shqme application, my bias appeared, perfect Buddy, sit wait and kiss me, comfort rewinder, love tractor, red candy, the sales department cupid, love so pure, dangerous convenience store, safe partner
Thats all hahahahahahaha it looks like i wrote down my whole list btw happy reading hope you like it love you mwha.....