I don't have any first-hand experience of LINE Webtoon, but I'd like to point out that there's a difference between having scenes of, for example, suicide in your comic, and glorifying or encouraging it. I'm pretty sure most of you aren't writing comics that tell the readers to go and kill themselves (at least I hope so).
Pushing examples to the extreme, "Maus" shows us the most terrible things the Nazi regime did - but it's not glorifying it, on the contrary.
As for the "include execution scene or corpses, causing a strong aversion" part... I feel like the placement of the comma here miiight be a bit wonky... Either they only want you to not post images of corpses that cause "a strong aversion" or they don't want any corpses at all because they cause a strong aversion. Honestly, I can't tell.