How to get to No.2 Store of Myeongdong Sky Garden Hotel from Incheon Airport in Seoul (by subway)

There is a bus. If you must take the subway, take airport metro to Hongda entrance station, then transfer to Line 2 to the entrance of the B branch (Euljiro 1(il)-ga) station, get off at Exit 5, and walk for about 300 meters.

You can also have a look at the raiders post that I posted, which should be helpful to you.

Generally, planes go to Incheon, and the subway in Incheon also passes through Gimpo Airport, so even Gimpo takes this road.