Here is scenario in which Doosan makes the postseason with 23 additional wins (50 total).

Here are the final standings in the scenario:
            Team	W	L	D	PCT	GB
          Hanwha	116	27	1	0.8112	0.0
              LG	103	37	4	0.7357	11.5
             SSG	100	42	2	0.7042	15.5
         Samsung	85	57	2	0.5986	30.5
          Doosan	50	89	5	0.3597	64.0	See explanation of tie-breakers below.
           Lotte	50	89	5	0.3597	64.0	See explanation of tie-breakers below.
          Kiwoom	51	91	2	0.3592	64.5
             KIA	50	90	4	0.3571	64.5
              NC	49	89	6	0.3551	64.5
              KT	48	91	5	0.3453	66.0

Explanation of Tie-breakers:
Doosan and Lotte 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	41	27	1	75	0.603	0.0
              LG	40	27	2	75	0.597	0.5
           Lotte	37	30	3	74	0.552	3.5
              KT	36	31	3	74	0.537	4.5
         Samsung	36	32	1	75	0.529	5.0
             SSG	34	32	2	76	0.515	6.0
             KIA	34	33	1	76	0.507	6.5
              NC	29	33	4	78	0.468	9.0
          Doosan	27	39	3	75	0.409	13.0
          Kiwoom	20	50	2	72	0.286	22.0

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	-	0	6	0	1	0	7	9	0	0	23
Hanwha	7	-	8	10	8	6	9	7	10	10	75
KIA	0	0	-	0	3	0	4	9	0	0	16
Kiwoom	6	0	7	-	4	0	7	7	0	0	31
KT	6	0	2	3	-	0	0	1	0	0	12
LG	10	0	11	7	11	-	9	8	7	0	63
Lotte	0	0	6	0	7	0	-	0	0	0	13
NC	0	0	0	0	9	0	10	-	1	0	20
Samsung	10	0	6	11	9	0	8	5	-	0	49
SSG	11	0	11	10	8	4	5	10	7	-	66
-----------------------------------------------------------------------------------
Losses	50	0	57	41	60	10	59	56	25	10

					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	0	0	0	0
KIA	1	0	-	1	2	0	0	0	0	0	3
Kiwoom	0	0	0	-	0	0	0	1	0	0	0
KT	0	0	2	0	-	0	2	0	0	0	2
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	3	0	2	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	3	3	11	10	3	1	50
Hanwha	12	-	13	15	13	10	12	13	14	14	116
KIA	7	3	-	5	7	2	8	13	3	2	50
Kiwoom	9	1	10	-	6	3	9	9	0	4	51
KT	12	3	7	10	-	3	2	3	5	3	48
LG	13	5	14	13	13	-	12	13	12	8	103
Lotte	5	4	8	7	12	1	-	3	5	5	50
NC	3	3	3	6	13	3	13	-	4	1	49
Samsung	13	2	13	16	11	4	11	11	-	4	85
SSG	15	2	14	12	13	8	11	14	11	-	100
-----------------------------------------------------------------------------------
Losses	89	27	90	91	91	37	89	89	57	42

					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	0	0	0	1
KIA	1	0	-	1	2	0	0	0	0	0	4
Kiwoom	0	0	0	-	0	0	0	1	0	0	2
KT	0	0	2	0	-	0	2	0	0	0	5
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	6
Samsung	0	0	0	0	0	0	0	1	-	1	2
SSG	0	0	0	0	0	0	0	0	0	-	2
-----------------------------------------------------------------------------------
Total	5	1	4	2	5	4	5	6	2	2

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