Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Airing date | Number of episodes | HD format | Highest average point ratings | Genre | Official website |
| --- | --- | --- | --- | --- | --- |
| 1 Jan- 27 Jan | 20.0 | Yes | 37.0 | Modern comedy | Official website |
| 28 Jan- 22 Feb | 20.0 | No | 32.0 | Modern drama | Official website |
| 25 Feb- 28 Mar | 25.0 | Yes | 29.0 | Period action | Official website |
| 31 Mar- 25 Apr | 20.0 | No | 32.0 | Modern drama | Official website |
| 28 Apr- 23 May | 21.0 | No | 34.0 | Costume drama | Official website |
| 26 May- 20 Jun | 21.0 | No | 31.0 | Modern drama | Official website |
| 23 Jun- 21 Jul | 20.0 | No | 30.0 | Modern drama | Official website |
| 21 Jul- 15 Aug | 20.0 | Yes | 32.0 | Modern drama | Official website |
| 25 Aug- 19 Sep | 20.0 | Yes | 31.0 | Modern drama | Official website |
| 22 Sep- 24 Oct | 24.0 | No | 30.0 | Costume action | Official website |
| 27 Oct- 5 Dec | 30.0 | No | 29.0 | Period drama | Official website |
| 8 Dec 2008- 2 Jan 2009 | 20.0 | No | 28.0 | Modern drama | Official website |
Question:
What are the number of episodes when the genre is modern drama and the highest average ratings points are 28?
Answer:
20.0