Here is scenario in which Doosan wins 81 additional games (98 total) but does not reach the postseason.

Here are the final standings in the scenario:
            Team	W	L	D	PCT	GB
          Hanwha	96	44	4	0.6857	0.0
              LG	96	44	4	0.6857	0.0
              KT	98	45	1	0.6853	-0.5	See explanation of tie-breakers below.
         Samsung	98	45	1	0.6853	-0.5	See explanation of tie-breakers below.
             SSG	98	45	1	0.6853	-0.5	See explanation of tie-breakers below.
          Doosan	98	45	1	0.6853	-0.5	See explanation of tie-breakers below.
              NC	41	99	4	0.2929	55.0
             KIA	37	103	4	0.2643	59.0
           Lotte	24	119	1	0.1678	73.5
          Kiwoom	23	120	1	0.1608	74.5

Explanation of Tie-breakers:
The following table shows how many games each of the teams tied for fifth place in the scenario have already won against each other:
Team	Doosan	KT	Samsung	SSG	Total
Doosan	-	1	2	3	6
KT	2	-	1	1	4
Samsung	3	2	-	0	5
SSG	3	2	3	-	8

The following table shows how many additional games each of the teams tied for fifth place win against each other in the scenario:
Team	Doosan	KT	Samsung	SSG	Total
Doosan	-	0	10	0	10
KT	13	-	3	13	29
Samsung	0	10	-	1	11
SSG	10	0	12	-	22

The following table shows how many games total each of the teams tied for fifth place win against each other in the scenario:
Team	Doosan	KT	Samsung	SSG	Total
Doosan	-	1	12	3	16
KT	15	-	4	14	33
Samsung	3	12	-	1	16
SSG	13	2	15	-	30

The first tiebreaker does not resolve the tie.
The following table shows how many runs each of the teams tied for fifth place as already scored against each other in the scenario:
Team	Doosan	KT	Samsung	SSG	Total
Doosan	-	13	26	25	64
KT	19	-	9	13	41
Samsung	33	10	-	8	51
SSG	20	10	16	-	46

The following table shows how many additional runs each of the teams tied for fifth place scores against each other in the scenario:
Team	Doosan	KT	Samsung	SSG	Total
Doosan	-	0	10	0	10
KT	13	-	6	13	32
Samsung	0	10	-	13	23
SSG	10	0	12	-	22

The following table shows how many runs total each of the teams tied for fifth place scores against each other in the scenario:
Team	Doosan	KT	Samsung	SSG	Total
Doosan	-	13	36	25	74
KT	32	-	15	26	73
Samsung	33	20	-	21	74
SSG	30	10	28	-	68


Doosan finished #0 in the standings last year.
Samsung finished #0 in the standings last year.

To construct the scenario, we start with the current standings:
            Team	W	L	D	GL	PCT	GB
              KT	23	12	1	108	0.657	0.0
              LG	22	14	0	108	0.611	1.5
         Samsung	21	14	1	108	0.600	2.0
             SSG	19	16	1	108	0.543	4.0
          Doosan	17	19	1	107	0.472	6.5
             KIA	17	19	1	107	0.472	6.5
          Hanwha	16	20	0	108	0.444	7.5
              NC	15	20	1	108	0.429	8.0
           Lotte	14	20	1	109	0.412	8.5
          Kiwoom	13	23	1	107	0.361	10.5

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	-	10	13	11	0	10	13	14	10	0	81
Hanwha	3	-	10	14	12	0	14	13	6	8	80
KIA	0	0	-	13	0	0	0	7	0	0	20
Kiwoom	0	0	0	-	0	0	10	0	0	0	10
KT	13	1	10	10	-	0	12	13	3	13	75
LG	0	6	13	13	11	-	13	11	0	7	74
Lotte	0	0	10	0	0	0	-	0	0	0	10
NC	0	0	0	13	0	0	13	-	0	0	26
Samsung	0	4	14	10	10	14	14	10	-	1	77
SSG	10	3	14	13	0	6	10	11	12	-	79
-----------------------------------------------------------------------------------
Losses	26	24	84	97	33	30	99	79	31	29

					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	1	0	0
Hanwha	0	-	0	0	0	4	0	0	0	0	4
KIA	0	0	-	0	0	0	1	3	0	0	3
Kiwoom	0	0	0	-	1	0	0	0	0	0	0
KT	0	0	0	0	-	0	0	0	0	0	0
LG	0	4	0	0	0	-	0	0	0	0	4
Lotte	0	0	0	0	0	0	-	0	0	0	0
NC	0	0	3	0	0	0	0	-	0	1	3
Samsung	0	0	0	0	0	0	0	0	-	0	0
SSG	0	0	0	0	0	0	0	0	0	-	0
-----------------------------------------------------------------------------------
Total	0	4	3	0	0	4	0	3	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	-	11	15	14	1	12	15	15	12	3	98
Hanwha	5	-	12	16	12	3	16	14	7	11	96
KIA	1	4	-	16	1	1	4	9	1	0	37
Kiwoom	2	0	0	-	2	1	12	2	3	1	23
KT	15	4	15	13	-	4	14	15	4	14	98
LG	4	9	15	15	12	-	15	15	1	10	96
Lotte	1	0	11	4	2	1	-	0	2	3	24
NC	1	2	4	14	1	1	16	-	0	2	41
Samsung	3	9	15	13	12	15	14	16	-	1	98
SSG	13	5	16	15	2	6	13	13	15	-	98
-----------------------------------------------------------------------------------
Losses	45	44	103	120	45	44	119	99	45	45

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