Buya (pronounced Boo-Ya) is one of the cities of NexusTK. In fact, it is the largest city in NexusTK. The city of Buya is also has the largest population of the three main cities, Buya, Kugnae, and Nagnang. Buya can be selected as a starting location for new characters. Buya is perhaps the most populated city because everything is very easy to access there. Most buildings of importance are right next to or very near one of the gates of Buya. Buya also has many spots that are used as social gatherings, perhaps another reason why it is so popular. Buya's gates lead to many places. The northern gate leads to the Buyan gathering, which can be used to travel across the lands of NexusTK. The western gate leads to the Vale, a somewhat frightening player-kill area. The eastern gate leads to the Islets, a dangerous but beautiful land that leads to Koguryo and the Ogre city of Hamgyong Nam-do. The southern gate leads to the north-west section of the Wilderness.
Creatures
Hunting areas
Most of the caves in Buya are similar to those in Kugnae. The notable exception is the Sute cave, which exists in Buya only.
| Area | Location | Prerequisites |
| Rat cave | 0015 0077 | Level 3 |
| Rabbit cave | 0111 0125 | Level 9 |
| Fox cave | 0124 0143 | Level 20 |
| Sute cave | 0103 0022 | Level 28, Sute dye |
| Haunted house | 0009 0065 | Level 36 |