Did you actually look at the bottom of the stall in the scene? Lmao the bottom of the stall is really low, he would not fit through the gap, only a foot would fit through that gap.
And like that person said ^ Most asian country bathroom stalls don’t have big enough gaps to see or fit through, and have a lot of coverage.
This is a Korean webtoon, so idk what's it like in Korea... but in Japan, yes the stalls are tall but, the ceiling height isn't. So if you stood over a toilet you could probably get out. It's to preventing peeping, not escaping. However it's nigh impossible to trap someone in a toilet stall like this because the doors open inwards lol, not outwards.
Crawl under the stall or over the stall