This is a route originally made as a Catholic pilgrimage route in order to honor Catholics that were persecuted. It is intended to start at the Catholic church near the Nakdong river and end at the Hanti Martyr's Shrine however the route as presented here is backward. In other words, start at the Hanti Martyr's Shrine and finish at the Catholic church near the Nakdong river. There is a small loop (a little over a kilometer) at the Martyr's Shrine that is included as part of the route.
There are stamp stations along the route and you can pick up a stamp book at the Catholic Church if you choose to do so.
Below is a link to the website for the route (it's in Korean).