It is good to choose Gloryinn Hotel if you travel to Seoul. The receptionist we checked in first night is kind and speaking fluency English. The location is convenient near 5 line metro and breakfast is delicious, moreover, you can get here from Incheon Airport by 6001 bus and the bus station is just opposite Gloryinn Hotel. You can also return to airport in the same station.
The place is between train station 乙支路4街 and 東大門, and the security nearby is safe. and some restaurants are nearby. but one problem is that my booked room's window outside is a shelter, for me it is not safe psychologically that it is easily for someone to climb in from the shelter, thus hoping some secure measure to solve this problem.