Any of the clubs I mentioned... especially my former club in Uijeungbu... they will all tell you who can coach LP sponge defensive style of play in and around Seoul.
Another former national player has a club you ought to check out. Lee Jae Chul (in Korean 이재철) his club is on the edge of Mapo area very close to Gongdeok Station. Club is only 400 meters away, if that.
Get off exit 5, go up the stairs and follow the sidewalk kinda to the left and stay on sidewalk. After 50 meters or so, you will be on a crosswalk, cross it and stay on the same direction. It will be 20 meters wide to cross. The sidewalk will now be wide and there will be a very tall building on the left. The only English sign you will see on this building is Deli Beans (if they are still in business) and a couple green signs with a white cross saying pharmacy in Korean. Keep this building on your left and stay on sidewalk. Keep going, you will on the sidewalk on the left see plastic extensions of Korean fried ready batter foods for sale. You see this, you are REAL close. Go past these and just past them, there will be a stairwell going up. Look careful, it is easy to go past it. The sign is yellow. Club is on 3rd floor. Go up the stairs to 2nd floor, there will be a billiards club. Walk past the billiards club to another stairwell, take it to 3rd floor and club is on the right, you will see and hear it.
Lee Jae Chul was a national player in the 70s and knows the TT scene. He is still a contributor in the Korean system and has connections.
This is the man in this pic with me and a few of my friends. TTD Members Brice and Firdaus are in this.
Here is a pic from a league they run at the club.