Here is scenario in which KT wins 10 additional games (75 total) but does not reach the postseason.

Here are the final standings in the scenario:
            Team	W	L	D	PCT	GB
          Hanwha	80	61	3	0.5674	0.0
              LG	80	61	3	0.5674	0.0
              NC	74	62	8	0.5441	3.5
         Samsung	76	64	4	0.5429	3.5
             SSG	74	64	6	0.5362	4.5
              KT	75	65	4	0.5357	4.5
           Lotte	68	70	6	0.4928	10.5
             KIA	65	75	4	0.4643	14.5
          Doosan	61	77	6	0.4420	17.5
          Kiwoom	43	97	4	0.3071	36.5

To construct the scenario, we start with the current standings:
            Team	W	L	D	GL	PCT	GB
              LG	80	49	3	12	0.620	0.0
          Hanwha	76	53	3	12	0.589	4.0
             SSG	65	60	4	15	0.520	13.0
              KT	65	63	4	12	0.508	14.5
         Samsung	66	64	2	12	0.508	14.5
           Lotte	63	64	6	11	0.496	16.0
              NC	61	62	6	15	0.496	16.0
             KIA	61	65	4	14	0.484	17.5
          Doosan	56	70	6	12	0.444	22.5
          Kiwoom	43	86	4	11	0.333	37.0

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	-	1	0	3	0	1	0	0	0	0	5
Hanwha	0	-	0	1	0	3	0	0	0	0	4
KIA	0	3	-	1	0	0	0	0	0	0	4
Kiwoom	0	0	0	-	0	0	0	0	0	0	0
KT	0	2	1	1	-	4	0	0	0	2	10
LG	0	0	0	0	0	-	0	0	0	0	0
Lotte	1	1	1	1	0	1	-	0	0	0	5
NC	1	0	4	1	1	2	2	-	0	2	13
Samsung	1	0	2	2	1	1	3	0	-	0	10
SSG	4	1	2	1	0	0	1	0	0	-	9
-----------------------------------------------------------------------------------
Losses	7	8	10	11	2	12	6	0	0	4

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

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	-	9	6	12	4	7	7	5	6	5	61
Hanwha	6	-	9	14	9	8	9	9	8	8	80
KIA	9	7	-	8	8	5	8	6	7	7	65
Kiwoom	4	2	6	-	5	7	4	5	4	6	43
KT	11	7	8	11	-	8	6	6	10	8	75
LG	9	7	11	9	8	-	9	8	9	10	80
Lotte	8	7	8	12	8	5	-	7	7	6	68
NC	9	6	10	10	9	8	9	-	7	6	74
Samsung	10	8	9	12	6	7	8	8	-	8	76
SSG	11	8	8	9	8	6	10	8	6	-	74
-----------------------------------------------------------------------------------
Losses	77	61	75	97	65	61	70	62	64	64

					Scenario Total Draws (Ties) With
Team	Doosan	Hanwha	KIA	Kiwoom	KT	LG	Lotte	NC	Samsung	SSG	Total
Doosan	-	1	1	0	1	0	1	2	0	0	6
Hanwha	0	-	0	0	0	1	0	1	0	0	3
KIA	0	0	-	2	0	0	0	0	0	1	4
Kiwoom	0	0	0	-	0	0	0	1	0	1	4
KT	0	0	0	0	-	0	2	1	0	0	4
LG	0	0	0	0	0	-	2	0	0	0	3
Lotte	0	0	0	0	0	0	-	0	1	0	6
NC	0	0	0	0	0	0	0	-	1	2	8
Samsung	0	0	0	0	0	0	0	1	-	2	4
SSG	0	0	0	0	0	0	0	1	1	-	6
-----------------------------------------------------------------------------------
Total	6	3	4	4	4	3	6	8	4	6