If you want to write to someone living in an apartment, you need to know the “dong” (the number of building) and the “ho” (the floor number and apartment number), but we could only provide you with the address of the apartment. However, we checked and it turns out there is only one building in Jungseok Town Apartment with twenty floors. Therefore, “1801” is probably her “ho”.
You can write to Sujeung Yoo as shown below.
1801 Jungseok Town Apartment,
No. 72-1, Sangin-dong, Dalseo-gu,
Daegu, Republic of Korea