Webtoons are a digital comic format that originated in Korea and has spread outside of the country.
The reddit dedicated to all things webtoons.
I agree with everybody in the comments.
In terms of a story that starts off good, and ends rather poorly, I can't think of one right now.
It came off as a bad attempt in surprising the readers with foolish plot twists by the author.
Even the rushed final episode doesn't make me regret reading it.