Here is scenario in which NC wins 50 additional games (86 total) but does not reach the postseason.

Here are the final standings in the scenario:
            Team	W	L	D	PCT	GB
              LG	89	52	3	0.6312	0.0
         Samsung	89	52	3	0.6312	0.0
             SSG	87	52	5	0.6259	1.0
          Hanwha	87	53	4	0.6214	1.5
           Lotte	87	53	4	0.6214	1.5
              NC	86	53	5	0.6187	2.0
          Doosan	49	90	5	0.3525	39.0
             KIA	49	92	3	0.3475	40.0
              KT	47	94	3	0.3333	42.0
          Kiwoom	30	109	5	0.2158	58.0

To construct the scenario, we start with the current standings:
            Team	W	L	D	GL	PCT	GB
          Hanwha	48	33	2	61	0.593	0.0
             KIA	45	36	3	60	0.556	3.0
              LG	45	37	2	60	0.549	3.5
           Lotte	45	37	3	59	0.549	3.5
             SSG	42	38	3	61	0.525	5.5
              KT	43	39	3	59	0.524	5.5
         Samsung	43	40	1	60	0.518	6.0
              NC	36	40	5	63	0.474	9.5
          Doosan	33	48	3	60	0.407	15.0
          Kiwoom	26	58	3	57	0.310	23.5

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	7	4	5	0	0	0	0	0	16
Hanwha	7	-	8	7	8	2	4	3	0	0	39
KIA	0	0	-	0	4	0	0	0	0	0	4
Kiwoom	0	0	4	-	0	0	0	0	0	0	4
KT	0	0	0	4	-	0	0	0	0	0	4
LG	8	3	8	7	9	-	1	0	5	3	44
Lotte	7	2	8	7	4	7	-	5	0	2	42
NC	7	1	9	7	8	5	3	-	2	8	50
Samsung	4	8	6	8	9	0	5	5	-	1	46
SSG	9	6	6	7	8	1	3	0	5	-	45
-----------------------------------------------------------------------------------
Losses	42	20	56	51	55	15	16	13	12	14

					Scenario Additional Draws (Ties) With
Team	Doosan	Hanwha	KIA	Kiwoom	KT	LG	Lotte	NC	Samsung	SSG	Total
Doosan	-	0	0	2	1	0	0	2	0	0	2
Hanwha	0	-	0	0	0	2	0	1	0	1	2
KIA	0	0	-	2	0	0	0	0	0	1	0
Kiwoom	2	0	0	-	0	0	0	1	0	0	2
KT	0	0	0	0	-	0	2	0	0	0	0
LG	0	1	0	0	0	-	1	0	0	0	1
Lotte	0	0	0	0	0	0	-	0	1	0	1
NC	0	0	0	0	0	0	0	-	0	1	0
Samsung	0	0	0	0	0	0	1	0	-	2	2
SSG	0	1	0	0	0	0	0	0	1	-	2
-----------------------------------------------------------------------------------
Total	2	2	0	2	0	1	1	0	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	-	4	9	11	8	4	4	2	5	2	49
Hanwha	12	-	13	15	13	6	8	10	5	5	87
KIA	7	3	-	6	11	4	6	4	3	5	49
Kiwoom	3	1	8	-	3	3	2	2	3	5	30
KT	7	3	5	13	-	4	4	3	5	3	47
LG	12	8	12	13	12	-	5	6	10	11	89
Lotte	12	8	10	14	10	10	-	9	7	7	87
NC	12	5	12	13	13	10	7	-	5	9	86
Samsung	11	11	13	13	11	6	8	11	-	5	89
SSG	14	10	10	11	13	5	9	6	9	-	87
-----------------------------------------------------------------------------------
Losses	90	53	92	109	94	52	53	53	52	52

					Scenario Total Draws (Ties) With
Team	Doosan	Hanwha	KIA	Kiwoom	KT	LG	Lotte	NC	Samsung	SSG	Total
Doosan	-	0	0	2	1	0	0	2	0	0	5
Hanwha	0	-	0	0	0	2	0	1	0	1	4
KIA	0	0	-	2	0	0	0	0	0	1	3
Kiwoom	2	0	0	-	0	0	0	1	0	0	5
KT	0	0	0	0	-	0	2	0	0	0	3
LG	0	1	0	0	0	-	1	0	0	0	3
Lotte	0	0	0	0	0	0	-	0	1	0	4
NC	0	0	0	0	0	0	0	-	0	1	5
Samsung	0	0	0	0	0	0	1	0	-	2	3
SSG	0	1	0	0	0	0	0	0	1	-	5
-----------------------------------------------------------------------------------
Total	5	4	3	5	3	3	4	5	3	5