Here is scenario in which Doosan makes the postseason with 19 additional wins (53 total).

Here are the final standings in the scenario:
            Team	W	L	D	PCT	GB
             SSG	102	39	3	0.7234	0.0
              LG	99	41	4	0.7071	2.5
          Hanwha	95	47	2	0.6690	7.5
           Lotte	86	53	5	0.6187	15.0
          Kiwoom	53	86	5	0.3813	48.0	See explanation of tie-breakers below.
          Doosan	53	86	5	0.3813	48.0	See explanation of tie-breakers below.
         Samsung	54	88	2	0.3803	48.5
              NC	52	85	7	0.3796	48.0
              KT	53	87	4	0.3786	48.5
             KIA	52	87	5	0.3741	49.0

Explanation of Tie-breakers:
Doosan and Kiwoom tie for fifth place and play a post-season game; the winner goes on to the wild-card game.

To construct the scenario, we start with the current standings:
            Team	W	L	D	GL	PCT	GB
          Hanwha	49	33	2	60	0.598	0.0
              LG	46	37	2	59	0.554	3.5
           Lotte	46	37	3	58	0.554	3.5
             KIA	45	37	3	59	0.549	4.0
             SSG	42	39	3	60	0.519	6.5
              KT	43	40	3	58	0.518	6.5
         Samsung	43	41	1	59	0.512	7.0
              NC	37	40	5	62	0.481	9.5
          Doosan	34	48	3	59	0.415	15.0
          Kiwoom	26	59	3	56	0.306	24.5

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	6	0	3	0	0	6	4	0	19
Hanwha	7	-	8	6	8	0	5	4	8	0	46
KIA	0	0	-	0	3	0	0	1	3	0	7
Kiwoom	6	0	3	-	3	0	0	7	8	0	27
KT	1	0	1	0	-	0	0	2	6	0	10
LG	8	6	8	7	9	-	6	5	4	0	53
Lotte	7	1	7	7	4	0	-	8	6	0	40
NC	0	0	8	0	6	0	0	-	1	0	15
Samsung	0	0	3	0	3	0	0	5	-	0	11
SSG	9	7	6	7	8	4	5	7	7	-	60
-----------------------------------------------------------------------------------
Losses	38	14	50	27	47	4	16	45	47	0

					Scenario Additional Draws (Ties) With
Team	Doosan	Hanwha	KIA	Kiwoom	KT	LG	Lotte	NC	Samsung	SSG	Total
Doosan	-	0	1	0	1	0	0	3	0	0	2
Hanwha	0	-	0	0	0	1	0	1	0	0	0
KIA	1	0	-	3	0	0	0	0	0	1	2
Kiwoom	0	0	1	-	1	0	0	1	0	0	2
KT	0	0	0	1	-	0	2	0	0	0	1
LG	0	0	0	0	0	-	3	0	0	0	2
Lotte	0	0	0	0	0	2	-	0	0	0	2
NC	1	0	0	0	0	0	0	-	1	1	2
Samsung	0	0	0	0	0	0	0	1	-	1	1
SSG	0	0	0	0	0	0	0	0	0	-	0
-----------------------------------------------------------------------------------
Total	2	0	2	2	1	2	2	2	1	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	-	4	8	7	7	4	4	8	9	2	53
Hanwha	12	-	13	15	13	4	9	11	13	5	95
KIA	7	3	-	6	10	4	6	5	6	5	52
Kiwoom	9	1	7	-	6	3	2	9	11	5	53
KT	8	3	6	9	-	4	4	5	11	3	53
LG	12	11	12	13	12	-	10	11	10	8	99
Lotte	12	7	10	14	10	3	-	12	13	5	86
NC	5	4	11	6	11	5	4	-	4	2	52
Samsung	7	3	10	5	5	6	3	11	-	4	54
SSG	14	11	10	11	13	8	11	13	11	-	102
-----------------------------------------------------------------------------------
Losses	86	47	87	86	87	41	53	85	88	39

					Scenario Total Draws (Ties) With
Team	Doosan	Hanwha	KIA	Kiwoom	KT	LG	Lotte	NC	Samsung	SSG	Total
Doosan	-	0	1	0	1	0	0	3	0	0	5
Hanwha	0	-	0	0	0	1	0	1	0	0	2
KIA	1	0	-	3	0	0	0	0	0	1	5
Kiwoom	0	0	1	-	1	0	0	1	0	0	5
KT	0	0	0	1	-	0	2	0	0	0	4
LG	0	0	0	0	0	-	3	0	0	0	4
Lotte	0	0	0	0	0	2	-	0	0	0	5
NC	1	0	0	0	0	0	0	-	1	1	7
Samsung	0	0	0	0	0	0	0	1	-	1	2
SSG	0	0	0	0	0	0	0	0	0	-	3
-----------------------------------------------------------------------------------
Total	5	2	5	5	4	4	5	7	2	3

# Doosan Bears magic number
# Doosan's magic number
# Bears magic number
# KBO Playoff Race