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:
| Heat | Lane | Name | Nationality | Time |
| --- | --- | --- | --- | --- |
| 3.0 | 4.0 | Elizabeth Beisel | United States | 4:34.55 |
| 5.0 | 4.0 | Katie Hoff | United States | 4:34.63 |
| 3.0 | 5.0 | Alessia Filippi | Italy | 4:35.11 |
| 4.0 | 4.0 | Stephanie Rice | Australia | 4:35.11 |
| 3.0 | 3.0 | Yana Martynova | Russia | 4:36.25 |
| 4.0 | 3.0 | Li Xuanxu | China | 4:36.35 |
| 4.0 | 5.0 | Kirsty Coventry | Zimbabwe | 4:36.43 |
| 5.0 | 5.0 | Hannah Miley | Great Britain | 4:36.56 |
| 4.0 | 7.0 | Katarzyna Baranowska | Poland | 4:36.95 |
| 4.0 | 1.0 | Kathryn Meaklim | South Africa | 4:37.11 |
| 3.0 | 7.0 | Maiko Fujino | Japan | 4:37.35 |
| 5.0 | 3.0 | Katinka Hosszú | Hungary | 4:37.55 |
| 5.0 | 2.0 | Zsuzsanna Jakabos | Hungary | 4:37.86 |
| 5.0 | 7.0 | Mireia Belmonte García | Spain | 4:37.91 |
| 3.0 | 6.0 | Keri-Anne Payne | Great Britain | 4:38.69 |
| 5.0 | 8.0 | Anja Klinar | Slovenia | 4:38.90 |
| 2.0 | 3.0 | Joanna Melo | Brazil | 4:40.18 |
| 2.0 | 7.0 | Sara Nordenstam | Norway | 4:40.28 |
| 4.0 | 6.0 | Camille Muffat | France | 4:40.29 |
| 3.0 | 8.0 | Tanya Hunks | Canada | 4:40.63 |
| 5.0 | 1.0 | Jessica Pengelly | South Africa | 4:41.04 |
| 3.0 | 1.0 | Samantha Hamill | Australia | 4:41.89 |
| 5.0 | 6.0 | Joanne Andraca | France | 4:43.88 |
| 3.0 | 2.0 | Helen Norfolk | New Zealand | 4:44.22 |
| 2.0 | 5.0 | Liu Jing | China | 4:44.96 |
| 2.0 | 1.0 | Jördis Steinegger | Austria | 4:45.15 |
| 4.0 | 2.0 | Saori Haruguchi | Japan | 4:45.22 |
| 1.0 | 3.0 | Nam Yoo-Sun | South Korea | 4:46.74 |
| 4.0 | 8.0 | Alexa Komarnycky | Canada | 4:46.98 |
| 2.0 | 8.0 | Susana Escobar | Mexico | 4:47.32 |
| 2.0 | 6.0 | Svetlana Karpeeva | Russia | 4:50.22 |
| 1.0 | 6.0 | Quah Ting Wen | Singapore | 4:51.25 |
| 2.0 | 2.0 | Katharina Schiller | Germany | 4:51.52 |
| 1.0 | 4.0 | Lew Yih Wey | Malaysia | 4:55.83 |
| 1.0 | 5.0 | Anna-Liisa Põld | Estonia | 4:58.21 |
| 2.0 | 4.0 | Georgina Bardach | Argentina | 5:00.87 |
| 1.0 | 7.0 | Nimitta Thaveesupsoonthorn | Thailand | 5:02.18 |
| 1.0 | 2.0 | Maroua Mathlouthi | Tunisia | DNS |
Question:
Who is from south korea and has a heat less than 3?
Answer:
Nam Yoo-Sun