Here is scenario in which Doosan makes the postseason with 0 additional wins (65 total).

Here are the final standings in the scenario:
            Team	W	L	D	PCT	GB
             KIA	88	52	4	0.6286	0.0
              LG	77	63	4	0.5500	11.0
         Samsung	76	64	4	0.5429	12.0
              KT	74	66	4	0.5286	14.0
          Doosan	65	75	4	0.4643	23.0
           Lotte	64	74	6	0.4638	23.0
          Hanwha	65	77	2	0.4577	24.0
          Kiwoom	64	76	4	0.4571	24.0
              NC	64	76	4	0.4571	24.0
             SSG	63	77	4	0.4500	25.0

To construct the scenario, we start with the current standings:
            Team	W	L	D	GL	PCT	GB
             KIA	81	50	2	11	0.618	0.0
         Samsung	75	57	2	10	0.568	6.5
              LG	68	62	2	12	0.523	12.5
              KT	67	65	2	10	0.508	14.5
          Doosan	65	66	2	11	0.496	16.0
             SSG	62	68	2	12	0.477	18.5
           Lotte	59	67	4	14	0.468	19.5
          Hanwha	60	69	2	13	0.465	20.0
              NC	58	71	2	13	0.450	22.0
          Kiwoom	56	76	0	12	0.424	25.5

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

					Scenario Additional Draws (Ties) With
Team	Doosan	Hanwha	KIA	Kiwoom	KT	LG	Lotte	NC	Samsung	SSG	Total
Doosan	-	0	1	0	0	2	1	0	0	0	2
Hanwha	0	-	0	0	0	0	0	2	0	0	0
KIA	0	0	-	2	0	0	1	0	0	0	2
Kiwoom	0	0	2	-	2	0	0	0	0	0	4
KT	0	0	0	2	-	0	1	0	1	0	2
LG	2	0	0	0	0	-	0	0	1	1	2
Lotte	0	0	0	0	0	0	-	2	0	0	2
NC	0	0	0	0	0	0	2	-	0	0	2
Samsung	0	0	0	0	0	0	0	0	-	2	2
SSG	0	0	0	0	0	0	0	0	2	-	2
-----------------------------------------------------------------------------------
Total	2	0	2	4	2	2	2	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	-	6	8	9	11	6	6	10	3	6	65
Hanwha	10	-	4	6	10	7	6	5	6	11	65
KIA	7	12	-	10	8	13	8	11	12	7	88
Kiwoom	7	10	4	-	3	11	8	7	8	6	64
KT	5	6	8	11	-	7	8	10	9	10	74
LG	8	9	3	5	9	-	12	13	7	11	77
Lotte	9	10	7	8	7	4	-	7	6	6	64
NC	6	9	5	9	6	3	7	-	6	13	64
Samsung	13	10	4	8	6	8	10	10	-	7	76
SSG	10	5	9	10	6	4	9	3	7	-	63
-----------------------------------------------------------------------------------
Losses	75	77	52	76	66	63	74	76	64	77

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

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