Here is scenario in which KT makes the postseason with 0 additional wins (79 total).

Here are the final standings in the scenario:
            Team	W	L	D	PCT	GB
              LG	86	56	2	0.6056	0.0
              KT	79	62	3	0.5603	6.5
             SSG	76	65	3	0.5390	9.5
              NC	75	67	2	0.5282	11.0
          Doosan	74	68	2	0.5211	12.0
             KIA	73	69	2	0.5141	13.0
           Lotte	68	76	0	0.4722	19.0
         Samsung	61	82	1	0.4266	25.5
          Hanwha	58	80	6	0.4203	26.0
          Kiwoom	58	83	3	0.4113	27.5

To construct the scenario, we start with the current standings:
            Team	W	L	D	GL	PCT	GB
              LG	86	56	2	0	0.606	0.0
              KT	79	62	3	0	0.560	6.5
             SSG	76	65	3	0	0.539	9.5
              NC	75	67	2	0	0.528	11.0
          Doosan	74	68	2	0	0.521	12.0
             KIA	73	69	2	0	0.514	13.0
           Lotte	68	76	0	0	0.472	19.0
         Samsung	61	82	1	0	0.427	25.5
          Hanwha	58	80	6	0	0.420	26.0
          Kiwoom	58	83	3	0	0.411	27.5

The next two tables show, respectively, how many of their remaining games each team wins and ties against each of the other teams in the scenario:

					Scenario Additional Wins Against
Team	Doosan	Hanwha	KIA	Kiwoom	KT	LG	Lotte	NC	Samsung	SSG	Wins
Doosan	-	0	0	0	0	0	0	0	0	0	0
Hanwha	0	-	0	0	0	0	0	0	0	0	0
KIA	0	0	-	0	0	0	0	0	0	0	0
Kiwoom	0	0	0	-	0	0	0	0	0	0	0
KT	0	0	0	0	-	0	0	0	0	0	0
LG	0	0	0	0	0	-	0	0	0	0	0
Lotte	0	0	0	0	0	0	-	0	0	0	0
NC	0	0	0	0	0	0	0	-	0	0	0
Samsung	0	0	0	0	0	0	0	0	-	0	0
SSG	0	0	0	0	0	0	0	0	0	-	0
-----------------------------------------------------------------------------------
Losses	0	0	0	0	0	0	0	0	0	0

					Scenario Additional Draws (Ties) With
Team	Doosan	Hanwha	KIA	Kiwoom	KT	LG	Lotte	NC	Samsung	SSG	Total
Doosan	-	0	0	0	0	0	0	0	0	0	0
Hanwha	0	-	0	0	0	0	0	0	0	0	0
KIA	0	0	-	0	0	0	0	0	0	0	0
Kiwoom	0	0	0	-	0	0	0	0	0	0	0
KT	0	0	0	0	-	0	0	0	0	0	0
LG	0	0	0	0	0	-	0	0	0	0	0
Lotte	0	0	0	0	0	0	-	0	0	0	0
NC	0	0	0	0	0	0	0	-	0	0	0
Samsung	0	0	0	0	0	0	0	0	-	0	0
SSG	0	0	0	0	0	0	0	0	0	-	0
-----------------------------------------------------------------------------------
Total	0	0	0	0	0	0	0	0	0	0

The next two tables show, respectively, how many total games each team wins and ties against each of the other teams in the scenario:

					Scenario Total Wins Against
Team	Doosan	Hanwha	KIA	Kiwoom	KT	LG	Lotte	NC	Samsung	SSG	Wins
Doosan	-	10	12	12	5	5	7	8	11	4	74
Hanwha	6	-	7	8	6	6	6	6	8	5	58
KIA	4	8	-	7	10	9	8	9	11	7	73
Kiwoom	4	7	9	-	9	4	8	5	8	4	58
KT	10	9	6	7	-	6	13	10	8	10	79
LG	11	9	7	11	10	-	10	6	10	12	86
Lotte	9	10	8	8	3	6	-	7	9	8	68
NC	8	9	6	11	6	10	9	-	8	8	75
Samsung	5	8	5	7	8	6	7	8	-	7	61
SSG	11	10	9	12	5	4	8	8	9	-	76
-----------------------------------------------------------------------------------
Losses	68	80	69	83	62	56	76	67	82	65

					Scenario Total Draws (Ties) With
Team	Doosan	Hanwha	KIA	Kiwoom	KT	LG	Lotte	NC	Samsung	SSG	Total
Doosan	-	0	0	0	1	0	0	0	0	1	2
Hanwha	0	-	1	1	1	1	0	1	0	1	6
KIA	0	1	-	0	0	0	0	1	0	0	2
Kiwoom	0	1	0	-	0	1	0	0	1	0	3
KT	1	1	0	0	-	0	0	0	0	1	3
LG	0	1	0	1	0	-	0	0	0	0	2
Lotte	0	0	0	0	0	0	-	0	0	0	0
NC	0	1	1	0	0	0	0	-	0	0	2
Samsung	0	0	0	1	0	0	0	0	-	0	1
SSG	1	1	0	0	1	0	0	0	0	-	3
-----------------------------------------------------------------------------------
Total	2	6	2	3	3	2	0	2	1	3

# KT Wiz magic number
# KT's magic number
# Wiz magic number
# KBO Playoff Race