In fact, the location is very easy to find. You can see it from Mingdong Street all the way east. It's on the south side of the road. It is said to be the earliest Catholic Church in Korea, and also the earliest brick church in Korea, Gothic architecture. It was a sunny day, and the light was shining through the cross on the top of the bell tower. The underground church was under the main altar of the cathedral. Since 1900, the remains of the martyrs in the period of persecution in Binshen have been preserved. Mass and prayers will be held at 10 a.m. I recommend you to come and have a look while you are shopping.