What would be a proper design of the relationships for this case?
Table 'one' has column "id", which is primary key and few other columns.
Table 'two' has column "applies", which is primary key and few other columns.

Table 'one' has 10 records / rows with "id"s values:
7
19
18
13
16
15
20
23
24
25


Table 'two' has 5 records / rows with "applies"s values:
15
16
18
23-24-25
7-13-19-20


What this means, for example, is that row with "applies"s value: 7-13-19-20, holds values in columns that are valid / applicable for
rows with "id"s values 7, 13, 19 & 20, from table one.
Rows 7, 13, 19 & 20, are alway joined to row 7-13-19-20.

I need a better way.
How to do it?

HINT: Table 'one' MUST NOT be altered!